Malicious PDF — malware analysis report

Static analysis result for SHA-256 188ebd2cbd1d4e0c…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313a000d11ce90c814d44c2a10877e5c SHA-1: 71df38a85e0fe9feaaac0018e7600ac3bf9b0dfb SHA-256: 188ebd2cbd1d4e0c926ea3f9032fed28e49321f89a258a4c087af1cc113b2617
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One prominent URL, 'https://ttraff.ru/pify?keyword=raf+cadet+uniform+badges', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obfuscate the 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.ru/pify?keyword=raf+cadet+uniform+badges
    • http://files.aardvarklearningacademy.com/uploads/1/3/2/8/132814050/gejozajud.pdf
    • http://kofefevet.thecenterpittsburg.org/uploads/1/3/1/6/131637814/mexaziwixon-samofuwet-texukuvogewox-zapekavoni.pdf
    • http://tatokid.krazines.com/uploads/1/3/1/0/131069992/9c6d6f6beab82dc.pdf
    • http://files.ucsbaccounting.com/uploads/1/3/0/8/130813366/zokas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/9669664948.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/john_deere_214.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/64320576959.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/khk_bevel_gear_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/45461414850.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/mikevifupit.pdf
    • https://cdn.shopify.com/s/files/1/0451/9126/6455/files/degoridedavajaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0447/1989/8777/files/ketubiwezuvub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.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_off00007458.bin
e89ac8d7b91eebcce766f563bace3f0f88d45fa46de6c4e62d1a6a314e7d82ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 5456 bytes
font_01_sfnt_off000086d0.bin
dc967e7dcf3520533df13dc34dcfcc89f32491eb1ccaf4fc818cd53df14c0b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 10012 bytes