Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c875d38e5befb6…

MALICIOUS

PDF

49.0 KB Created: 2020-08-22 21:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17089bd79403ea74fcccd47e226d91de SHA-1: b79172cf07ff061b5146a82968c7ffe3121d5bb4 SHA-256: 71c875d38e5befb6ff7c43a0644de6f7dfd0b27a8cdeabc8dc01b53cbf93d9c7
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating an attempt to direct users to malicious sites. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of multiple embedded links, many pointing to Shopify, suggests a tactic to obscure the malicious destination by using seemingly benign hosting for the initial PDF.

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=thyroid+cancer+guidelines+pdf
    • http://bakilulu.christmasinchilhowie.com/uploads/1/3/1/8/131856185/33710da41.pdf
    • http://varakire.emanueldeutschmann.net/uploads/1/3/0/7/130775085/bb6f11db6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/12292203117.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/15499112707.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5271/files/ljubljana_restaurants_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6728/files/gyrocopter_dota_2_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/42102393092.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/rawiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/67063142100.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/99628021631.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/cinematic_video_editor_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/zadepokojibugokijefobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/60125007439.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_off0000821d.bin
728d8ad7c29f38ab0801228628ebac185f7668fcb34dad322d611624612ae28f
pdf-font-stream PDF embedded font (sfnt) at offset 0x821D 5468 bytes
font_01_sfnt_off000094b8.bin
34e8ea38843de00a00113ca0d2e6979eb0dba58382eaaecb34d3c3c17f6797d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x94B8 10208 bytes