Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c57233fb778d29a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-23 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180258ae1a0496f52c9cdbfcf61b7cef SHA-1: 577ee8ec596aa13075799b2477d15916a6243090 SHA-256: 4c57233fb778d29a99c6c6506976cc93c2279a20e6ef4878998327ab610d06b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'glory glory hallelujah music sheet' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites via embedded links.

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=glory+glory+hallelujah+music+sheet
    • http://files.haltonquiltersguild.ca/uploads/1/3/2/6/132681665/tonabitularasaj.pdf
    • http://nosoto.remembrancestars.com/uploads/1/3/1/4/131438044/sakeluram_regetetolekuk_wotogope.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/penguin_readers_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/passive_voice_mixed_tenses_exercises_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0434/5462/7993/files/reading_comprehension_strategies_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/82219997957.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/diforinikazin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60801944673.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/afm_church_in_zimbabwe_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/50384889657.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/heroic_kil_jaeden_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/building_construction_images.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/front_desk_agent_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/tulosinizijusejokodijoj.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004977.bin
320dc043130f21c3d68d46ae74e142d3c790ac7584c4c5c0c02fe84176b66b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4977 5200 bytes
font_01_sfnt_off00005b3b.bin
d70f8c69dd4cfd8fe9831b2f6300e6ff0c0ea223ca3909f12973afa33cf4df25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3B 9592 bytes
font_02_sfnt_off00007c02.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 4324 bytes

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