Malicious PDF — malware analysis report

Static analysis result for SHA-256 165f90ae5b24fcf8…

MALICIOUS

PDF

56.9 KB Created: 2020-08-08 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d73aa5b4f4011e25283e70b497b50c SHA-1: b85f6bc53bb2887892a1c38a57065ee00855a95c SHA-256: 165f90ae5b24fcf8e7132d50f7f220677e4bd943974be9513e0e54a4e31ba4a0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to redirect users to malicious infrastructure. The presence of many external PDF links points towards a link farm or SEO manipulation tactic, potentially to distribute further malware or phishing content.

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/pify?keyword=non+faradaic+current+pdf
    • http://files.thurmontmainstreet.com/uploads/1/3/2/7/132712163/zodukunokizak.pdf
    • http://files.natureworld.com.au/uploads/1/3/0/9/130969508/perefofi.pdf
    • http://files.tnhillsaussies.com/uploads/1/3/1/0/131070971/1991089.pdf
    • http://files.rooibergsafaris.com/uploads/1/3/0/7/130775653/85fe33b986591.pdf
    • http://files.jouvertinjune.com/uploads/1/3/0/7/130775922/rofexejan-bebam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/mivetikuluwezujuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/56360037333.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/85972439248.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/automotive_technology_a_systems_approach_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/18416035591.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/tezududusakavenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/xeliwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9312/3491/files/rewasuligimewalinewaweni.pdf
    • https://cdn.shopify.com/s/files/1/0438/6832/4005/files/17582571013.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_off0000a313.bin
e42128e504aac61bf05dadd6107fec2be3596f803d6396739bb4f8606f7b6ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA313 4908 bytes
font_01_sfnt_off0000b3e1.bin
89fcf2945137c5b55d757b0430815cf5953d2c27445f17a739630111084dcf2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 10212 bytes