Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c96e20871c7c140…

MALICIOUS

PDF

65.3 KB Created: 2020-08-14 21:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b8b9eb51fe29a504cb27d715df3195 SHA-1: 9dfc265022f47099ed929cde1be15af440d917a0 SHA-256: 7c96e20871c7c14087dfba826bff68c2f8ec3f4202542043fdd2e0bb0679db93
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 pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation to increase visibility. 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.cc/pify?keyword=induction+and+deduction+english+worksheet
    • http://files.gwionraven.com/uploads/1/3/0/7/130739776/4916943.pdf
    • http://files.thehealerinyouutah.com/uploads/1/3/1/1/131163851/vutimomizivuwepem.pdf
    • http://pujofubud.hillcresteastpoint.org/uploads/1/3/1/4/131483281/06b8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/0528/6296/files/52772433577.pdf
    • https://cdn.shopify.com/s/files/1/0433/6497/4742/files/diloxulab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/moxamo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/project_budget_planning.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/45546184867.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/carson_dellosa_math.pdf
    • https://cdn.shopify.com/s/files/1/0428/4642/1158/files/faithless_drifting_away_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/biophilic_city.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/cellist_of_sarajevo_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/betubemurosarizotezupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/50606398269.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_off0000b4d0.bin
339710ca0d4c5b25ccfd1895f6b71f177ba39666c6b190722c3d3206c7edc8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 5176 bytes
font_01_sfnt_off0000c664.bin
375ff46d5419ed44d89d5f93fb738ac9f7c8f8b54238ffaaaa87eae5d1b1c951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 10352 bytes
font_02_sfnt_off0000e9b3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 4324 bytes

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