Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c0fc4e93e8ff61…

MALICIOUS

PDF

49.2 KB Created: 2020-10-25 18:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c98b8dfa54e7cc242acd17e9a247150 SHA-1: 45d3c6bbf614b2eb6ed048d3008a7e110801ebdd SHA-256: d4c0fc4e93e8ff6112df5332493bc4b80a7911d01cbf54ac44c8ee934d8d4f96
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting services and redirector infrastructure. The primary URL, 'https://ggtraff.ru/strik?keyword=undertale+ds+rom+download', suggests a lure for potentially unwanted software or malicious downloads. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=undertale+ds+rom+download In PDF document text
    • https://jokineviraxara.weebly.com/uploads/1/3/4/2/134265776/8567503.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/966a9b.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/tifogatofodadak.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/wivorajum-segugosivupor-jojiwakunulubob-ridituva.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/ritikitiwokej.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/viwesavojelisikuke.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/3240ee1bd.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/9320464.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/5361857.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/2953665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_5f9556350daa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f87db636405c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8a06a967e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f86ffbb3680c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f9037ebc871d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7b97d7f7-a4b6-4fdf-addf-0a4244fe9b65/15521221138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc147d-d8ea-47a3-a32f-21dceb2b1f53/zanawakobajofizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe803555-9014-4821-99ff-a9ecc2cf31da/19825453047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4286754-69f5-4ce1-8dd5-053e42f59b68/dibedenibatudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac99e39-1d76-4789-8d09-f54017802e1b/mawelugaxezeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa50e0e4-b834-4cc8-ae61-b812a75fcaa6/gafekuves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842fbe50-6ea8-4ed6-be53-42bb929244e4/jewutejawekasusuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d711525-23fc-45a8-b88a-3b5edf45a6d4/everyday_counts_calendar_math_printables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3446945-4c09-48e3-b8c8-f144940bc3d6/rimodugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b72aa80-088a-4fa4-b513-00aa2c178f3e/29016431926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec35dc1c-6d5b-4b67-b2b3-99f2fc2a4556/najukazod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7524 4796 bytes
SHA-256: f701c4398b76f3e4c3a104a5901da95f4bad6a466d9f4454c106626939f91580
font_01_sfnt_off00008562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 10380 bytes
SHA-256: 4ae29da693acc36a994da3db45c99cecb4a2aee981233d86fab2d07988e2ba64
font_02_sfnt_off0000a8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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