Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f14661d0b1804c…

MALICIOUS

PDF

90.8 KB Created: 2020-12-27 22:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 539a7c4152b6a777bc35cee12d885533 SHA-1: 9c4d896d90e4b197de5f455e703a7ee71a326fe6 SHA-256: b8f14661d0b1804ce17a4ae929a5abf728d0af7eb68913817638183769dd99d7
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. The embedded URLs, such as https://gettraff.ru/123?utm_term=cricut+expression+2+manual+pdf, are likely part of this infrastructure. Although no scripts were explicitly extracted, the nature of the heuristics and the presence of numerous external links strongly suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gettraff.ru/123?utm_term=cricut+expression+2+manual+pdf In PDF document text
    • https://cdn.sqhk.co/linigurep/hbEtAgh/fast_food_mexican_takeout_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/gdEpULu/47388302222.pdfIn PDF document text
    • https://cdn.sqhk.co/tizarina/QKR1ifi/85662405788.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/uT0uif4/88150275981.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/kodukomuvukuzefer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f2c9ce-3a70-43ea-a74c-8cafebe97ee2/38527208679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f454874-0a40-41a4-8d26-c1d22b81de1a/69930026570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68786699-6dac-4fcf-9963-e34e2457f758/wifomokufadak.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/vesavuzuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ba72e7-14be-4734-9706-e03816d0070d/gakazimevosaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 5408 bytes
SHA-256: 875edf7b5aa9ac74e7565676d59834dfb4c8a7192440400b9efd55014596e546
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 3708 bytes
SHA-256: f427866b856ea165e1ab6fdb125874eb8b8b5006d18a1bd98aaeea0544e02a4f
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 10928 bytes
SHA-256: 8988b1bc9b99bd90923fa967dcbe3201139ec261ce579802fcf10c1deb93dd44
font_03_sfnt_off00013c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 11652 bytes
SHA-256: a4449abfedb93019f88931e5e213cb9bb99a838a7ad13d3974264472bb5bf357

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