Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf70826b52b20b7…

MALICIOUS

PDF

39.8 KB Created: 2020-08-13 15:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab0a883f90725f37b9a577f78aaac420 SHA-1: 2fe8b146bea0d5245a850b89e1ecf1c3fe97d689 SHA-256: 6cf70826b52b20b74bb6b11c23e04578f2d7e64740aad2697b14b020f01e2666
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and references to 'wkhtmltopdf', suggesting it was generated programmatically. The presence of many external PDF links, some benign and some unknown, points towards a link farm or SEO manipulation tactic, potentially leading to 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://ttraff.ru/pify?keyword=alman+dili+d%25C9%2599rslik+pdf
    • http://files.hannahwasserman.com/uploads/1/3/1/6/131637177/fujifowato-jejasop-tezetapavuk.pdf
    • http://files.sugarrushcustomcreations.com/uploads/1/3/0/7/130739809/pejajepisom.pdf
    • http://wipuxid.thebibleclicks.com/uploads/1/3/0/7/130738629/e045668d0.pdf
    • http://nejekoto.danamalart.com/uploads/1/3/1/4/131437421/gebilusajiregaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7200/2974/files/65740569867.pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/50427548424.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/shading_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/old_ayurveda_books_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9845/files/basic_counseling_skills_handout.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15125842299.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/weranuwiwepuwafetamov.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/aadhar_card_update_offline_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/mebenefo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4663/2614/files/waninaduzat.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/classroom_management_techniques_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/arduino_microcontroller_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/airway_management_in_maxillofacial_trauma.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_off00004ecb.bin
e25fb8f86652159f36d61a94ed9d3f46158bae54e2ad8fab9f9d43a39f12d40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECB 4836 bytes
font_01_sfnt_off00005f0a.bin
3f2727bc3a6bdb84b785aeaf88491a23e69b2d2eb8c3b8f9225cb0e66c5a0a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 11884 bytes
font_02_sfnt_off000084f9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F9 4324 bytes

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