Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7a13a713449564…

MALICIOUS

PDF

40.8 KB Created: 2020-08-16 19:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6460c9a6da40be1bad1eb41e10b16ead SHA-1: ce29a601aaff49d45a195bf4130ff53e18f84f61 SHA-256: 7a7a13a7134495648aee8f88fa44b5e05bc1fc97723a97638b914d6b91c88b5f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body also contains the same URL, suggesting an attempt to trick users into clicking it for a fake download. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent.

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=stickers+whatsapp+apk
    • http://files.norfolkvintagehire.co.uk/uploads/1/3/1/4/131454102/4292211.pdf
    • http://files.michaelmillermemorialfoundation.com/uploads/1/3/1/4/131438111/nesaxugidivujej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/dodafeledovevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/las_frases_mas_comunes_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/gadixego.pdf
    • https://cdn.shopify.com/s/files/1/0437/7450/9213/files/13036969229.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/against_method_paul_feyerabend.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/fadekikisuzorulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/52482470260.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/the_gods_are_bastards.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/rewezudukapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/romozizufod.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/ielts_writing_task_2_sentence_structure.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_off00006189.bin
d8859f829b3847cb14851c0464ef565d4e36b8eecb62959ee1fe858507fb37cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6189 5248 bytes
font_01_sfnt_off00007363.bin
09bd108d4057facd02c93b242f8e5470ce8cac6e7f7094dc0fac33c0d984f5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7363 10336 bytes