Malicious PDF — malware analysis report

Static analysis result for SHA-256 169c787fbfedf09d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-14 05:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcabc61342634ccfcc64f6bad5a2b3c8 SHA-1: b93dc82e1b0ece62c7a94d54a88ea143184f6b43 SHA-256: 169c787fbfedf09dd5bd1d16418705d5c73079f9083092ccd23c15dee25ad593
174 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to direct users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the presence of multiple external links points to a link farm or redirection attack.

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/wb?keyword=metallurgy%20for%20non%20metallurgist%20pdf
    • http://files.realtorblogging101.com/uploads/1/3/2/6/132680908/9176474.pdf
    • http://files.fastbirthcertificates.com/uploads/1/3/2/6/132682892/ladajin.pdf
    • http://wulasa.mrwisner.com/uploads/1/3/1/3/131378950/4ceadb6808.pdf
    • http://files.rollepodiatry.co.uk/uploads/1/3/0/8/130874585/e09b5de7bb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/susedelagobefafa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/luxibakibi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0769/files/nebupug.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/capites_de_areia.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/94725765237.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/demand_definition_economics.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/bevonafupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/57628641686.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/87913766977.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/siete_canciones_populares_espaolas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/pebomuzipesamidal.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_off0000591a.bin
1baab41b690e2051c55d839dcea08895e1a42d12ca7ddeb7401fed2bebf6879f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 5468 bytes
font_01_sfnt_off00006bb5.bin
cb27bc79da435f2ca0348747511860597a81dd7bf09c8f81719b452abaf66216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 10712 bytes

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