Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0a176e64573251…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 02:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5cee5d156f1cbdba73afe3c031e2c52 SHA-1: 060777b06070ac591f65388a41424a290e024c6a SHA-256: ac0a176e6457325144f4d17d2e81236cde0b0c4f0c935da2f701be5504c93bb3
152 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.com, which is presented as a guide. The document also features a large number of links to various PDF files hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful sites.

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/wb?keyword=how%20to%20make%20bookmarks%20open%20in%20pdf
    • http://files.cammiebehnke.com/uploads/1/3/0/7/130738799/2353988.pdf
    • http://files.scswat.com/uploads/1/3/1/4/131454238/a6646db9634.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/95348036274.pdf
    • https://cdn.shopify.com/s/files/1/0428/4301/3287/files/43851920748.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/1455988402.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7204/files/samir_aouchiche.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/64057753396.pdf
    • https://cdn.shopify.com/s/files/1/0431/3917/0466/files/lumarolipoweju.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/vofeloloxoradexak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc8.bin
9fd039e19ff44b14093aea3e7db451a8c87988404ce0d819db2c43b1ae261172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC8 5412 bytes
font_01_sfnt_off00006f21.bin
7533687b5acedba7890cae4d66859627a4b4579f4dcb08ce5edcae7836823b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 9916 bytes

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