Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2fd5650b75d357…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 20:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f8f7b4dccbc5154c16281ae44620c4 SHA-1: 21f8766705e2641f94800d22f2c87f9b9cb91781 SHA-256: ff2fd5650b75d35787cf93179628a70218582562870628647133f46fea8a877f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'Synonyms and antonyms first grade worksheets' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=synonyms+and+antonyms+first+grade+worksheets
    • http://mexaku.briarcreeksportsmanclub.com/uploads/1/3/0/9/130969204/legabijexozaxig-tasanavipurekom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4403/files/jopulobapazonipujisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/how_to_upload_photos_to_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0102/files/bistronomy_french_food_unbound.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/65967886433.pdf
    • https://cdn.shopify.com/s/files/1/0437/6857/8210/files/mastering_chemistry_chapter_2_homework_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/2933/0077/files/2012_honda_civic_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/40537646042.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/26950978328.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/calisthenics_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0436/9652/1369/files/zumdahl_chemistry_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/nusipakakadopi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6835/files/introduction_to_structural_dynamics_and_aeroelasticity_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641e.bin
066b221ade283144a9783a8ac442df4d50fbccccf8237131c492ccd4f6a52f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 5648 bytes
font_01_sfnt_off0000773d.bin
10ff5c6924de3463018bb3079e7fbdbb0955e33046a25898876b2d6cbcc244cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 10680 bytes

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