Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9e4f5120d18774…

MALICIOUS

PDF

42.4 KB Created: 2020-08-14 12:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32a76d3638d38b9a08e439e8fcf61e4b SHA-1: 7b5475fa286d093d72bf55d014667b0336e18feb SHA-256: 3a9e4f5120d187744cde86b7fd9d8df7cd737473ba0d1c2033a4bd60a2bff7d5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.ru' which is associated with malicious activity. The document body, though partially corrupted, contains text related to game cheats and the PDF generation tool, suggesting a lure. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be redirecting users to malicious infrastructure 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=arabalar+oyunu+hilesi+apk
    • http://jexokaten.irishancestral.com/uploads/1/3/1/3/131398560/tiribened.pdf
    • http://fejirit.vibezcreativeartsspace.com/uploads/1/3/2/7/132710621/804a05.pdf
    • http://files.denverbap.com/uploads/1/3/2/3/132303351/d6c1973.pdf
    • http://files.tedhowe.com/uploads/1/3/0/7/130739081/wegorokunefu.pdf
    • http://xixedezun.armadalecoc.com/uploads/1/3/1/3/131379732/8830504.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/79236254984.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/20194461537.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/92116636396.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/12327478468.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3653/files/brandt_daroff_exercise_for_vertigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/general_aptitude_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/pelisuvopulisogoxabux.pdf
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/lagawaweravaxenajezamidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/15448421857.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/75903894851.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/zelogiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/4051917858.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_off000065fe.bin
7e0ddab56f4ae339a0f7c8777172b21176c84aa23b5dae0972373db79b1056ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FE 5200 bytes
font_01_sfnt_off000077a2.bin
f89978240b5c508fbedab155fdae92ecf51bfff73df42c7fe0ae2d545b256118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 11376 bytes

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