Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621dad69ccfd069…

MALICIOUS

PDF

70.6 KB Created: 2020-11-25 07:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ffdb6f9d81d7c0843c19c37e830dab69 SHA-1: 1b3a6b1cc79e6c4e6ebaf2ee4524e058ed6b36eb SHA-256: c621dad69ccfd069688eca23faf7e0b26ba4d7993f3008336aa5b7c0a3725a18
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least two identified as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, contains text related to games and the authoring application, suggesting a lure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=helicopter+shooting+games+unblocked In PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/94b75.pdfIn PDF document text
    • https://davavenetu.weebly.com/uploads/1/3/4/5/134500413/6cfb5e3fe1bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fb7fd339534d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f935715dfd4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pidufozu/webasto_dual_top_evo_6_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/2018_calendar_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2042914-906d-4837-b5a6-23ba55fc8b83/nofudasawepuzoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2753d7-ef68-4f92-807f-09c74c03f9ea/play_unblocked_games_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/manual_de_bacteriologia_medica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531a280b-6991-486f-9393-f3f39ca3c75d/kojeva.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/fate_stay_night_heaven_s_feel_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/bitamunafapo.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/sheboygan_county_register_of_deeds_address.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 5532 bytes
SHA-256: baaa023e46b34eb90b2a9ec63934131550581a51943aac4a8d40864e34f58536
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 12108 bytes
SHA-256: 9cc6d82a56d8c864d3c26f7bdbff1445d80103cf6d1f9712a0fbd5aacfdf4441
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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