Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d74a09d2c09bb…

MALICIOUS

PDF

36.2 KB Created: 2020-08-09 18:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f18c197c8d3329048d962d17a36a8fb9 SHA-1: af30628e8c5bfe0a6b78ab24205eedf0ba9eeabe SHA-256: 4a8d74a09d2c09bb8dc391cf89c7fc040cffdacacfbff6f696f4e62119c580cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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.com/pify?keyword=circle+of+life+choral+pdf
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdf
    • http://files.sapphireimagery.com/uploads/1/3/1/3/131398377/kudugidosep_rorunadojexir_juxavi.pdf
    • http://gigimep.pedrohemsley.com/uploads/1/3/1/4/131453540/5928352.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/beginner_english_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/25686420414.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/ignition_temperature_of_fuels.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/smok_nord_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9233/7059/files/zututabelivezapasekugipo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/encyclopedia_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/68211370079.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6460/files/game_theory_economics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/zetenemexizepumafejotix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0433/4537/9478/files/xuxapufoforinuzopigiwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.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_off00004598.bin
724929bee8c0ab09d9d80e49523fa8164a015a373050f477edf4c2be132b93e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4598 4692 bytes
font_01_sfnt_off0000558d.bin
15da6d7f7afcc3029033bff7d1057d24213eddf0bdf3fd63d899fe8f67cba117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558D 9460 bytes
font_02_sfnt_off000075c1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 4324 bytes

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