Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19200b707f75f1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-16 22:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 149face83e6be4a47cc0e30e6726a10c SHA-1: adbfd21586ded630f8fa9d86809705dc6f93e568 SHA-256: 7b19200b707f75f1f11ab34f931106cbeeef1224d93503b0aa974e9e780c02e8
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify. Additionally, the ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains what appears to be a link to the same malicious URL and also lists numerous benign-looking Shopify URLs, likely part of a link farm to improve SEO for malicious content. The presence of a 'download button' lure further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=algebraic+expressions+and+equations+worksheet+pdf
    • http://files.roam-sick.com/uploads/1/3/0/7/130740213/tagaxun.pdf
    • http://files.surelockedin.com/uploads/1/3/1/8/131860787/6bba590d70.pdf
    • http://nidapef.adultdaycenter.org/uploads/1/3/2/6/132683071/kusak.pdf
    • http://xiledovo.abramcreek.org/uploads/1/3/2/7/132740813/tebure_fovewilopi_dikedimimu_valalonupip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/centrifugal_fan_impeller_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/8869168469.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/99804177092.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/jujejuxupefoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/fingerprint_based_attendance_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/allison_transmission_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/87888754165.pdf
    • https://cdn.shopify.com/s/files/1/0440/1951/5557/files/56712867995.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bd7.bin
88ce53dafae8f4d79852c31beb69feeae73ae27bf0ec8570da5bee50cdb34f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD7 5780 bytes
font_01_sfnt_off00006f7f.bin
5c9038eb6a0586adce378884e61edb01af9d45b44dfa618860f22bc0d17ee183		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 10144 bytes
font_02_sfnt_off0000923c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923C 4324 bytes

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