Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f8ee41c542fe2…

MALICIOUS

PDF

54.5 KB Created: 2020-10-06 18:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df2e61aaf58e7fc02dbcd5825d66013f SHA-1: 890b12e804948fb3263fa77228b94eb02891eaab SHA-256: 171f8ee41c542fe2f775043d4da74a9be61652a50a57a73a4578adeed3b8069d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links that point to known malicious redirector infrastructure and a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that matches one of the malicious links. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these links, which likely leads to further malicious activity.

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 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.
  • 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=recueil+de+poeme+pdf In PDF document text
    • http://mefosabe.lanakoleauthor.com/uploads/1/3/1/4/131438667/rubaveseke-muvasasapevuxi-gafofuwida.pdfIn PDF document text
    • http://sudare.thespringschurch.net/uploads/1/3/0/7/130739873/98c4646ae852db8.pdfIn PDF document text
    • http://files.theacceptedlife.com/uploads/1/3/1/1/131164556/56a80a255273a9e.pdfIn PDF document text
    • http://mejekajiv.hdca.org.uk/uploads/1/3/1/4/131483453/kirozurolofekiji.pdfIn PDF document text
    • http://files.halloweeninthehills.com/uploads/1/3/0/7/130740420/jebizepusala_meragarafuguzu_vomunemixit_divivalijagatob.pdfIn PDF document text
    • http://files.vermontpsychoanalytic.org/uploads/1/3/1/3/131384127/423e7c9bccf.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/1/0480/9120/1700/files/ml_in_a_shot_glass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5079/4145/files/36347095193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/video_release_form_template_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6787/8807/files/merriam_webster_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/first_aid_step_1_qbank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8aad7f8-a1a1-4490-ac0a-2fa25db6209d/vidimiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c9e2c0-bf50-4e5d-94b7-2c352751295f/sazisazoj.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_off00009653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9653 4824 bytes
SHA-256: be06983f4c247782a641f1b6859f14f912be256f501f6d7179998cdb1f249cd7
font_01_sfnt_off0000a6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B9 12012 bytes
SHA-256: 6751497a0c058ed012e2bcce3aa033616bbca9c1cc03e8121d211cdce9550cd7

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