Malicious PDF — malware analysis report

Static analysis result for SHA-256 636149d80e86e488…

MALICIOUS

PDF

34.6 KB Created: 2020-08-18 14:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00afea117aadeddb7e13c70c607b3681 SHA-1: fdf11cffc2cfc696c9d52bfbe21aea861e55f5db SHA-256: 636149d80e86e4886448a517bc6e0ab5afc2926a3642b50aa0a70a7105f985a4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a manual, which is a common lure for phishing or malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the embedded URL 'https://ttraff.ru/pify?keyword=alemite+oil+gun+manual' strongly indicate this intent. The ML classifier also flagged the PDF with high confidence. While no scripts were directly extracted, the PDF structure and malicious link suggest it's designed to lead the user to a malicious site, potentially for exploitation or further payload delivery.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=alemite+oil+gun+manual
    • http://pelopiga.boltcatering.com/uploads/1/3/1/3/131378950/323f8d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/71570055059.pdf
    • https://cdn.shopify.com/s/files/1/0430/1229/2767/files/16963264692.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/jemorig.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/38754020997.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/around_the_way_girl_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/bronkopneumonia_menurut_who.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/gakipedetexarizosu.pdf
    • https://cdn.shopify.com/s/files/1/0454/6088/1560/files/class_11_ncert_accountancy_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/28762846054.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/5_point_scale.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_off00004af6.bin
938763faf51bc48e2b11f01be2e96ff9e8a1a31c32b0b4439bdc0713cef93b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF6 4720 bytes
font_01_sfnt_off00005af9.bin
9e1abb214c1b38909587e7c0427ed7f9aaac0a4f26db000592d1a2c350568c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 10228 bytes

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