Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2f200c736180ab…

MALICIOUS

PDF

48.9 KB Created: 2020-08-18 22:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d449b055541e9c1366dc737964fde49e SHA-1: 3e699d53bb88223539d0d35c7b85d56a93f6882d SHA-256: 0a2f200c736180ab7f585f5ebca684e8b690db4ccf8e47735726cdebd12396d4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to distribute malicious content. One prominent URL, 'https://ttraff.ru/pify?keyword=bachelor+of+commerce+course+enrolment+guide+acu', is identified as a malicious redirector. The document body, though partially corrupted, includes this URL and other Shopify links, suggesting a lure to disguise the malicious redirection. The ML classifier strongly flagged this PDF as malicious.

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=bachelor+of+commerce+course+enrolment+guide+acu
    • http://files.ginotorres.com/uploads/1/3/1/1/131163747/timejazuw.pdf
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://files.allamericancricketleague.org/uploads/1/3/1/4/131407005/retofogi.pdf
    • http://files.makercenterusa.com/uploads/1/3/1/4/131407877/ripagoraripaxivaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/16246714809.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/fetodusivebetibode.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2932/files/evaluating_functions_worksheet_with_answers_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/tejujawaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/bratislava_street_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2357/files/98386446087.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/29367607414.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/zuritejemavejawufumoze.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/wigadegefizuwew.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/73195567707.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_off00008105.bin
d495c761a332bdddb1d8d2becd3de12c217929de62bf97f79906383ec2c6def6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8105 5484 bytes
font_01_sfnt_off00009383.bin
dead9cf54ff2d68dcc8bc5329674a8bdb6daabc6388af9e4be2230313f5dda71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9383 10360 bytes

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