Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf7f308d7942710…

MALICIOUS

PDF

61.0 KB Created: 2020-08-15 21:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e3130bdf9f89ca291849cf48bd5d83c SHA-1: 85a64157fe814d232a44cd0f6f0924e504b0325b SHA-256: 0cf7f308d794271026578dbe3e140008c9c3e47007f5a2c1184424029672c5db
154 Risk Score

Malware Insights

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

This PDF contains a high number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.com/wb?keyword=electrostatics%20pdf%20class%2012, which is likely used to direct users to further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm or SEO manipulation tactic.

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.com/wb?keyword=electrostatics%20pdf%20class%2012
    • http://files.derbyshiredaleswinesociety.org/uploads/1/3/1/8/131871730/nuwiliditeb.pdf
    • http://files.scwpsych.com/uploads/1/3/1/4/131454345/watipojonanebu-zidanawolute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/vezivotukejidowetunutejok.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/kufukojaforuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/70961780786.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/wezipol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/kexod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/nupogelirivinolovazuto.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/caregiver_burnout_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/23786662697.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008514.bin
b69672a677d7f410a2eeb23134c3029f397decf6c6fa78cb65289449f20e78ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8514 5292 bytes
font_01_sfnt_off0000971f.bin
6f5c095ca6bbd2fd72c37be825f47388bf0431d9791024bc4e548a45280de387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971F 13684 bytes
font_02_sfnt_off0000c2a2.bin
51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A2 16088 bytes
font_03_sfnt_off0000d796.bin
d05e760f6b09777b218384c4e10abb9da46aa9039c5f3ff864e168d1d6808186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 4048 bytes

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