Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1728d534090b4b…

MALICIOUS

PDF

86.1 KB Created: 2021-01-12 12:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fa5497e895ec463e25e714660317f8e5 SHA-1: d804aaae8a1bd7d17335fdfc323193e015a44e01 SHA-256: 6b1728d534090b4b03b2b363072ae400c3e2db8d0951713b84d41a9158c25aa6
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host and distribute links rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=dragon+city+game+breeding+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_5fcf012295332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fa872842b3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fb4aa69b1738.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/0gijfP1/the_bonfire_forsaken_lands_free_ios.pdfIn PDF document text
    • https://wikujodavo.weebly.com/uploads/1/3/4/6/134649345/686164.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/jddZyhf/top_10_one_punch_man_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5feb03720aff8.pdfIn PDF document text
    • https://vavurozuzen.weebly.com/uploads/1/3/1/0/131070500/8328105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_5fa4248277729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff02d62ada7f.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/4487103.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/2748195.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/b01rjas/living_room_furniture_sets_for_small_spaces.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/4989951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 5292 bytes
SHA-256: 4c5b7153e593a9bfc113d60fdab6450d5813521dd51a0f0a17bb21939c531fac
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 10792 bytes
SHA-256: 19ad3f3a80b8b70d99672c9f1a79ad0f16fae272913af05e3b2b810f018ef23e
font_02_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 16416 bytes
SHA-256: 27d452bb595f791c094307cecd6aaad636795dcb39b085b0c84be341a66bf267

Open this report in the interactive analyzer, or submit your own file for analysis.