Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9185cf68b3afec…

MALICIOUS

PDF

38.4 KB Created: 2020-10-03 05:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d4d70f7122c08c804c9e55fa99fbe3b SHA-1: 3de5e2887dc108b066786bd3fe6f8c402eb6cb06 SHA-256: bd9185cf68b3afecfe70cb3cb1f29d6d01c9325e406c80f85b663d6db348947f
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that is part of this redirection chain. The ML classifier also strongly indicated maliciousness.

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://ttraff.club/pify?keyword=willamette+valley+pie+company+coupon In PDF document text
    • https://site-1039443.mozfiles.com/files/1039443/45162685285.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/zawijogobixorel.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/liwuwazeloti.pdfIn PDF document text
    • https://site-1038451.mozfiles.com/files/1038451/roresu.pdfIn PDF document text
    • http://kirogi.brindlebird.com/uploads/1/3/1/8/131856158/2646065.pdfIn PDF document text
    • http://files.devitadiamonds.com/uploads/1/3/1/4/131437728/9994928.pdfIn PDF document text
    • http://nurinokux.vickysahlin.com/uploads/1/3/2/7/132740815/mezes_xizoluza.pdfIn PDF document text
    • http://xilebozu.laromana.ca/uploads/1/3/1/3/131384380/bunurinijomalejape.pdfIn PDF document text
    • http://files.stagepresence.ca/uploads/1/3/0/7/130775629/4266131.pdfIn PDF document text
    • http://farilonil.kemiesho.com/uploads/1/3/0/8/130874030/9166673.pdfIn PDF document text
    • http://files.hillcountrywoodshop.com/uploads/1/3/1/4/131453843/tolabolizonuzu_mewibe_lamuzalaweto_zevipedofi.pdfIn PDF document text
    • http://jamidu.mcsspreschool.ca/uploads/1/3/0/9/130969754/ramufutod.pdfIn PDF document text
    • http://posoji.labonteinsurance.net/uploads/1/3/1/3/131383444/2928532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97563b66-8e17-40e8-a2dc-19befb522ed4/doluter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e69d00-7281-4356-a9df-b383ed680640/80681745681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3c7078-ebef-4a9f-b519-63c4c1be9793/40686039020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C6 4980 bytes
SHA-256: 74b0bf1bc9a9992c65019261e1acdd956b2795e10a219dc2e57bdd9576b808c0
font_01_sfnt_off000067c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C3 10692 bytes
SHA-256: 735158b7b8a05aad0b14222dc6227631d0269e68ebca7441646f8087bf60af62

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