Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bd1d6d728ad158…

MALICIOUS

PDF

72.9 KB Created: 2020-12-23 17:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98b5e69bd14fb98804ebd3a149c47a0a SHA-1: 209c8473cb72f6cd458a4cff65ce6a64a9e55681 SHA-256: 91bd1d6d728ad15874913c8632d39bf73bbc121c9af42df5011fd7b5554f3dca
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector and others forming a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'mashup songs' and application metadata, suggesting a lure to disguise the malicious redirection. No scripts were extracted, but the presence of numerous external links points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=best+mashup+songs+on+apple+music In PDF document text
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/sepad-kedutufu-pogiratirexe-nuvipokelilogu.pdfIn PDF document text
    • https://birulivalofa.weebly.com/uploads/1/3/4/0/134013213/082abbfd0e.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/kivowof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fad2e3a77ade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/perurulexi/red_velvet_bad_boy_live_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3efa983-27c1-43dd-8d85-c9e0ec505472/ogrillon_baldurs_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1851f058-2ae6-4c27-89fb-123ecf19663f/62244484153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394a98ce-6026-46c0-8cef-675c6580b4d2/sowifawajigegozarinedot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a24f80-e02a-49ee-9002-a1326a494045/69619848393.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/bandhan_film_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c1433c-81ec-425a-92cf-a305588502bf/12616169968.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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 5300 bytes
SHA-256: fe0c9e831ca2accd02fddb212049a4e224144647441ec995bd0944b2a7088cd1
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10748 bytes
SHA-256: 5186536b38aee2a9f0b3a1afab8649196c824d386410de8502e464b60ebefac6

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