Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b5f7b4a8e5c5ee…

MALICIOUS

PDF

37.1 KB Created: 2020-08-08 06:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44ec0e2d91ae456fd5ed27baea1d3e64 SHA-1: bb6d0352302f1f1774e52321801f68b472857701 SHA-256: 76b5f7b4a8e5c5ee1ad5f822af502af176c173449c991570e027a344948e2fca
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=phonics+for+reading+pdf, which is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious infrastructure.

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=phonics+for+reading+pdf
    • http://files.newcovenantinspections.com/uploads/1/3/2/7/132740338/xoserubetezeno.pdf
    • http://files.flocrowcroft.co.uk/uploads/1/3/1/8/131856446/xurapega.pdf
    • http://files.nympa.com/uploads/1/3/2/7/132710671/jinosonas-lepetiduvazika-tolibopojul.pdf
    • http://matolikup.emilyervinphotography.com/uploads/1/3/1/3/131384169/sujekuxom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/minecraft_forge_energy.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/71487322212.pdf
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/hey_jude_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/xusuzolugijupadudose.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/63731230660.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/jivanujosedimerubozagoxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/83905927994.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/91708611144.pdf
    • https://cdn.shopify.com/s/files/1/0434/2785/6536/files/kuzutawegimujilapake.pdf
    • https://cdn.shopify.com/s/files/1/0435/4283/9455/files/fopawabemizila.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/nikupotisadekiziserozago.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/appointment_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/zebupozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/74067011751.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_off00005545.bin
992e0a63237bf61851cd8c2245bd259b0d07e56c3904ca8875bcd90066d8c6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 5384 bytes
font_01_sfnt_off00006796.bin
c1923f830e4ac811d1f39e144f3b32f1549a41613bee4876b027157c7898a4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6796 9268 bytes

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