Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dae09519c2d3f2…

MALICIOUS

PDF

51.9 KB Created: 2020-08-21 05:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53a908e8e2245c8941d9df04b7208a2 SHA-1: d1a24b209e7d54127b12d523d675631ede0051bf SHA-256: 74dae09519c2d3f2e8004b38d111caf861201bf9bfe57aa1b6bb2f5388465675
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing indicating it's a link farm pointing to a malicious redirector. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=brain+workshop+net'. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting an attempt to direct 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=brain+workshop+net
    • http://files.rooibergsafaris.com/uploads/1/3/1/4/131454459/lufev-lomatazogamir-rifososipoxojem.pdf
    • http://toximifu.sabracelets.org/uploads/1/3/1/1/131164250/ruxatisorupiriketa.pdf
    • http://files.mrsras.com/uploads/1/3/1/8/131871721/pojedatevolajuju.pdf
    • http://vovigog.riverglennkennels.com/uploads/1/3/1/4/131454215/nixezexirazezib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/15861395958.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/15749732493.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/english_to_french_translation_course.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/abnormal_liver_enzymes_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vexib.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/17801588736.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/zekipivonejil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9616/2972/files/the_adlard_coles_book_of_diesel_engines.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/96267375044.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/mimidigagefoferinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/susimukaxuzopifasinuxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/antologias_literarias.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_off00008083.bin
9230cb22403442e43b2e1d707aa19af177c677376ba37281082b1dbc6b065083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 4868 bytes
font_01_sfnt_off00009110.bin
23d9b65048aa08119f7a7c0cb6e87ffa4fa35a43fc667a34b72943561af89e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9110 10360 bytes
font_02_sfnt_off0000b48a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 4324 bytes

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