Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a338332210b793c…

MALICIOUS

PDF

50.1 KB Created: 2020-08-06 21:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b6f21b981f24bd3e7a75a8bd188da7 SHA-1: 252d89fd6ba730a73d0e2247dc6aa23804e314e1 SHA-256: 6a338332210b793cd8c1d28bab6d26c42d036b8946b457528c68a9fc24ef985c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=reading+skills+notes+pdf'. The document's structure and the presence of many external links suggest an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF's nature and the malicious URL strongly indicate a phishing or content-luring attack vector.

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.ru/pify?keyword=reading+skills+notes+pdf
    • http://files.caterpillarspirit.com/uploads/1/3/1/4/131437225/f401ed9e36ef.pdf
    • http://files.laurenpaigekennedy.com/uploads/1/3/0/8/130814597/mixelobemuzopives.pdf
    • http://files.haymakerlaw.com/uploads/1/3/0/7/130739651/9109208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/gazusujapizafi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/vovuvelokumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/logrolling_definition_ap_gov.pdf
    • https://cdn.shopify.com/s/files/1/0435/3520/4511/files/cengage_physics_2020_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/18580262749.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/zepotemevijutegidexabun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/61645699603.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/lopor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/rainbow_table_attack.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/explain_branches_of_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/renowo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000859b.bin
11944d859e29cefe2ccefd057c780819d75f1d759754c65e0d35d2542b21d1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859B 5184 bytes
font_01_sfnt_off00009766.bin
5556d7c1d4136d09e6d905da46bfe72f4f5f98451b10be845fa042a03cd60f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 10420 bytes

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