Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf718ffc1e0e415…

MALICIOUS

PDF

41.1 KB Created: 2020-09-20 02:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea85deb657e2b0b218aa37d077968f04 SHA-1: c04326690c68c71559d584bd7c49e4ea5a3993bc SHA-256: caf718ffc1e0e4158f83a07787e0317c6da1edd4e1f70048adbc706f2b8906cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 PowerShell

The PDF contains multiple embedded links, with a critical heuristic firing indicating it's a malicious redirector. One prominent URL, 'https://ttraff.club/wix?keyword=muthead+madden+19', is directly linked to malicious redirector infrastructure. Another heuristic identified a link farm pointing to various PDF files, suggesting an attempt to distribute or host malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://ttraff.club/wix?keyword=muthead+madden+19
    • http://files.msterryportfolio.com/uploads/1/3/1/0/131070938/766274.pdf
    • http://files.partnersinhopeusa.org/uploads/1/3/1/1/131163902/9fd8152de923.pdf
    • http://files.octoberpvd.com/uploads/1/3/1/3/131380889/1c5bf4510.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/special_education_teacher_assistant_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/contaminacion_del_aire_tesis.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/fiziwaxawasave.pdf
    • https://cdn.shopify.com/s/files/1/0441/3489/1672/files/mosaneginetatirab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/special_characters_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/suferowamatidatafuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2848/7072/files/all_in_one_bangla_tv_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5478/2869/files/censoring_in_survival_analysis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006353.bin
ce74689dd0b8d778450013a2b3a0604a68124ab645d3e4b4789aceeaf2cd3a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 4972 bytes
font_01_sfnt_off00007428.bin
55eb965c3e1488796e3a9fc55686eba097b6b221beba6f889ef22994b8ffc37f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 10412 bytes