Malicious PDF — malware analysis report

Static analysis result for SHA-256 0340ad28582fd474…

MALICIOUS

PDF

48.4 KB Created: 2020-08-23 20:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6d1a8083fd3f16d1e6b8d1a7feac969 SHA-1: 13ab4434652aba6f8385be49618a26cac405dcdb SHA-256: 0340ad28582fd474d14a59158c6d85b33026a2f620e248139d71bd5b93e9b3b0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate traffic and potentially lead users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=top+builder+html+template'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains, suggesting a phishing or scam attempt.

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.cc/pify?keyword=top+builder+html+template
    • http://files.bradfordwatkinsmedia.com/uploads/1/3/2/3/132303242/sazumedepifelog.pdf
    • http://files.relicwinecellars.com/uploads/1/3/1/6/131636972/2018000.pdf
    • http://files.kidscottagekg.com/uploads/1/3/0/9/130968943/3362210d77.pdf
    • http://tikilug.valleycottagerentals.com/uploads/1/3/1/8/131857284/5768179.pdf
    • http://files.meghanshope.org/uploads/1/3/1/3/131381363/gelotavoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2448/1431/files/born_rich_action_planner.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/81329859344.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/dojukije.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/55047773381.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/pofijuwemaled.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/gotezekedipedovalad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/gikixojadu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3651/files/34750745017.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/bubokabizorugifunexavuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/best_catalogue_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/belitokajemusa.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_off00008010.bin
d7692f87c7f4e7522730b16b9dd881d4709be9e41a074d0070833d89d7838488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8010 5112 bytes
font_01_sfnt_off0000913c.bin
e61229cc00d4e38cc4dbcdedc4d1a93fedc18bbeeaf91e54fc82486980748db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913C 10232 bytes

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