Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b16d7802d056cd…

MALICIOUS

PDF

39.8 KB Created: 2020-07-31 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28a1df5a356c9dbfe5f5b6e69ce57322 SHA-1: cb2dda1c070f6ceb192353ab937f2919292bf1af SHA-256: e0b16d7802d056cdfc6e2f3d7a2253d30c63e3ac9f34c5d9c989314f703d699a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

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=design+research+in+architecture+pdf
    • http://files.pamela-roose.com/uploads/1/3/0/7/130739180/joxovasowixesij-dozet-monoreganot.pdf
    • http://files.dresslikeanangel.com/uploads/1/3/0/7/130738841/tafanofumu-dutivasalusufa.pdf
    • http://files.petersenacpcourses.com/uploads/1/3/0/7/130775245/aee3c25.pdf
    • https://cdn.shopify.com/s/files/1/0440/3871/7605/files/pevurabiratarovivedox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/81576095383.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2647/files/69876319140.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/xipew.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/vababoparaneba.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/bixizotupowelexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4446/0951/files/31409861424.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4393/files/daderuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/40074508587.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/36528483538.pdf
    • https://cdn.shopify.com/s/files/1/0437/3233/6791/files/pitafidozid.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/
    • https://cdn.shopify.com/s/files/1/0428/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f82.bin
faa7ddcce3a57144174a39e44effb73b07b8ffce141d2c1121a2c49562fc7998
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F82 5156 bytes
font_01_sfnt_off00007105.bin
d7693e992eafbeb8247ea521ebf75879bf7305dfe4797d785f4c5be6087c2427
pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 9756 bytes