Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d9f08f91bd483a…

MALICIOUS

PDF

37.1 KB Created: 2020-08-08 13:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3fb20dcd0298f92cc3416ce0f24e8a2 SHA-1: d1d0b4b7e7da524e0b4182834d248d6ff7a0088e SHA-256: 78d9f08f91bd483a610a573d56900150b4d963c3641293a9d020f8507b097b0a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same redirector URL and numerous other URLs, many hosted on Shopify and other file-sharing services, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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=articles+a+an+the+pdf+exercises
    • http://files.recraftindy.com/uploads/1/3/2/6/132681836/fekevuvu_kugopowesojab_kojofolevoxepe_raxobesoji.pdf
    • http://files.airstreaml2004jl.com/uploads/1/3/1/4/131406173/bepunabudikabop.pdf
    • http://files.themountainforge.com/uploads/1/3/1/1/131164558/6546a79e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/sun_tracker_pontoon.pdf
    • https://cdn.shopify.com/s/files/1/0434/6875/0998/files/zidewodorabavekenok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/26096445500.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/katakisulolemodepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/25569247294.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/96321038452.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/lidigixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/fewapubaxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/pixiguwog.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/calculus_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0438/0891/5613/files/48298274632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/gogowoxibuzipudedebemenez.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_off00005353.bin
5e56d52823252ddf9d9602a29f872b682940353100c15558f1176d415ec07776
pdf-font-stream PDF embedded font (sfnt) at offset 0x5353 5300 bytes
font_01_sfnt_off00006560.bin
06c54dbaa758d6e6c5887203fe8cd6a20bcec765bc3eb11ba5a23659c475e7fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 10000 bytes