Malicious PDF — malware analysis report

Static analysis result for SHA-256 b309f15ce5e0c17c…

MALICIOUS

PDF

44.7 KB Created: 2020-11-01 05:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ded642150b0c4e274b67eba412eaf16 SHA-1: 83afcd5f0e0a2a6f0b612723882cb14770e0c4ca SHA-256: b309f15ce5e0c17ce4178bd16b0795c3defb590c627263707d599b49eb6dbf60
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that point to other PDF documents. Several of these links, including a primary redirector URL, are associated with malicious infrastructure. The document's structure and the presence of a malicious redirector suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/aws?keyword=ulysses+guide+books In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8d89260fbf4.pdfIn PDF document text
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/269a79db2.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/nesuziguwepufir.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/e719af3a4ec.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/wusizebufipami-vebeb-fisalogirus-xopelefoguronet.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/jejezutesuvi-tulevipisa-wukotomudali-dufadenel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2810/1304/files/pathfinder_dragonrider_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930726ef-93b3-4e7d-b721-55d28728043a/70079658308.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/momojotax.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/flagellated_protozoa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7131/4326/files/kuxiseliwilogunun.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_off0000691b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691B 4984 bytes
SHA-256: 914b76e08e18c7899628f2e82fb04aa97374365101f021bf542b6e5011e0e73c
font_01_sfnt_off00007a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000082b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B3 10396 bytes
SHA-256: 5513e5ac9eaebc9a8140701a98b467a597556049dce3dee4df39c9a7c643a730

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