Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d639a6b9f8681…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 01:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65a6444788df8dc7f4b9f649f418a7e8 SHA-1: 612898110085b84446fd0dc3fdedeb3b53ee4ed2 SHA-256: 875d639a6b9f8681605e7a93be56da830ad013dfa117c065099fb3933160a212
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.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=electric+forklift+checklist+template', suggesting a lure to a phishing or scam page. The presence of numerous other PDF links, many pointing to benign Shopify domains but some to unknown domains, indicates a link farm or redirection strategy. No scripts were extracted, but the overall structure and URL suggest a phishing or malicious redirection attempt.

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=electric+forklift+checklist+template
    • http://ziniri.hongqiangliu.com/uploads/1/3/0/9/130969060/lalitosejagemakuxu.pdf
    • http://files.thediscreetsommelier.com/uploads/1/3/2/6/132681767/tiledanijilep.pdf
    • http://files.handcrafted1995.com/uploads/1/3/2/7/132711983/nuleduzajararum.pdf
    • http://lawixafo.ikhlastours.co.nz/uploads/1/3/2/3/132303093/9422080.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/22647923052.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/savatizewakuviduxetibil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1069/5074/files/dell_xps_15_bluetooth_driver.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/pata_chalgea_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/22196406668.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/the_final_adventures_of_sherlock_holmes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/duzokelijo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6a.bin
0e3104300b387ce0c5a95cb9a009aecab0ba59c729fbefb0640556aba1d39c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 4956 bytes
font_01_sfnt_off00006e39.bin
6731110c6be6f6697e77a7ff5346fde9da0c3e201dc4dfd96000e7fced7897a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E39 9892 bytes
font_02_sfnt_off00009004.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9004 4324 bytes

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