Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6fa890c76b94e4…

MALICIOUS

PDF

44.2 KB Created: 2020-10-14 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f384c38e8b984a14567cc7c09b6d3e06 SHA-1: 5da96b6fc170c03a82aa338df8860b382539ebd2 SHA-256: 3c6fa890c76b94e451667e39b793b756b0014122803db9036fd912680da0198d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body itself contains URLs that are likely part of a link farm designed to lure users to malicious sites. The presence of embedded links suggests an attempt to trick the user into navigating to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/strik?keyword=liniertes+papier+ohne+rand+pdf In PDF document text
    • https://site-1039419.mozfiles.com/files/1039419/93198559412.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/jiwibizemafakifir.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/vuzuvakizamalifimeb.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/613a711ec7ef.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/9051060.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.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://cdn.shopify.com/s/files/1/0483/9440/3989/files/intervention_gun_sound.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2806/5689/files/990763701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/2939/1516/files/85749537480.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_off00005c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 4824 bytes
SHA-256: 5cb12ca9b05bc08031a316bad65220e3e03485ad661e8f514a9e5f9e7e099a9d
font_01_sfnt_off00006ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA2 12384 bytes
SHA-256: 78d565fc507a38e1ff5ee0a4cf53990206c828e2ecae3cf52a22ce45bef27cbc
font_02_sfnt_off0000948d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x948D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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