Malicious PDF — malware analysis report

Static analysis result for SHA-256 b635aacfc48d6a14…

MALICIOUS

PDF

60.5 KB Created: 2020-10-08 10:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b02bea3fb2d524f2b9e0b697f885b986 SHA-1: 91f6826b9764fbd1d7d2278f42393748aa15a0a0 SHA-256: b635aacfc48d6a141ef54ba5565a000e063a8332b03945d39b6ae4d3a3efdcff
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence point towards a malicious intent, likely related to phishing or malware distribution.

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://gettraff.ru/strik?keyword=skyrim+se+xbox+one+load+order
    • http://tabokim.sophie-elise.co.uk/uploads/1/3/2/6/132683188/34954a.pdf
    • http://files.georgetownpiano.com/uploads/1/3/1/4/131406140/1793716.pdf
    • http://files.katemarch.com/uploads/1/3/1/3/131380493/lapolezogurasedaf.pdf
    • http://files.allstudentsallstandards.org/uploads/1/3/0/8/130873876/7027927.pdf
    • http://tijadep.850plants.com/uploads/1/3/0/7/130739344/gamiteduzalare-nodejezefago-rewuvej.pdf
    • http://files.artystafoto.com/uploads/1/3/0/7/130739530/segiva_rivuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/75209840-c92d-40d0-9461-71b150433eea/35236021902.pdf
    • https://uploads.strikinglycdn.com/files/eff393c9-86c2-4db2-ac65-51633d3d76fb/kidogujagozovitabojane.pdf
    • https://uploads.strikinglycdn.com/files/91e32067-9c8e-494f-a958-aa72fa74d0fa/38478358205.pdf
    • https://uploads.strikinglycdn.com/files/96dfb50c-60f5-4ae0-add5-bdc3ddc5d0fe/36067835154.pdf
    • https://cdn.shopify.com/s/files/1/0485/2164/2146/files/gw2_how_to_get_ascended_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0497/1970/5761/files/pulikibededoverizinune.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/fisher_paykel_dryer.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_off0000a06b.bin
e8da1162d041ed88bb4a85560df7e9512c5b25b7a612fa655318cc478c60c2ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06B 5156 bytes
font_01_sfnt_off0000b1ca.bin
76eedc1abf25a7e049d3fa363aea306dd03ee3a9403605df1bd20aff6b5f3d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 11028 bytes
font_02_sfnt_off0000d74b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 4324 bytes

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