Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ce22d99b289de…

MALICIOUS

PDF

76.2 KB Created: 2021-01-08 02:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 194895d38b91a7782b79f67410e2e37c SHA-1: 4cc35d3668f61b89dbd80e8f191aace3a0f54897 SHA-256: 3d2ce22d99b289de89b4c7003c74c3b202b436c6dcaf03809a264a65d9872368
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'traffmen.ru'. This URL is associated with a keyword search for 'video player apk android 4.2', suggesting a lure to download potentially malicious software. The presence of numerous PDF links, including one to 'uploads.strikinglycdn.com', indicates a link farm, likely for SEO manipulation or distributing further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/wb?keyword=video%20player%20apk%20android%204.%202 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8914e114e93.pdfIn PDF document text
    • https://fejomuzuzozasas.weebly.com/uploads/1/3/4/7/134748710/7749365.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/bac1f2b4.pdfIn PDF document text
    • https://paseboke.weebly.com/uploads/1/3/4/4/134432883/vibilotaxi_wumudawesi_pezaleteze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fb68d635a50c.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/1351b68a-6e73-4d0f-9de0-7de95e65d4cc/gesifisenediliwezoxes.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/actors_studio_alumni.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/belizukasuxuxibemuxivu.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/basic_calculus_grade_11_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/da_form_for_risk_assessment_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/84063652502.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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5160 bytes
SHA-256: aa975b324472bbc23c593fc9a356ae4da73bb565b2832d4c4f56f5df0d60ad47
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 11412 bytes
SHA-256: c88f43da0e8ceb2da766525e7d3e6de990f86ac9255e4f54ca0e1f105f0577f3

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