Malicious PDF — malware analysis report

Static analysis result for SHA-256 61be86debcf95082…

MALICIOUS

PDF

38.9 KB Created: 2020-08-09 21:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c6f11bdcca9e7b489cdf435d708624 SHA-1: 3bdea48147c7ed8186059dd4c88f1d203fc150e1 SHA-256: 61be86debcf95082d493c60ed881fa3d5703f09e123af2b1a335c7f53c502663
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting it's part of a link farm designed to manipulate search engine rankings. One of the primary links, https://ttraff.ru/pify?keyword=argala+stotram+pdf+free+download, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the redirector indicate a malicious intent to lead users to potentially harmful content.

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=argala+stotram+pdf+free+download
    • http://files.utahdeafhistory.com/uploads/1/3/1/4/131407152/7603830.pdf
    • http://files.theschoolofmakingthinking.com/uploads/1/3/0/7/130776363/5f844b4b1.pdf
    • http://files.bobkuhne.com/uploads/1/3/1/4/131406744/1780995.pdf
    • http://files.jonathanstoney.com/uploads/1/3/1/3/131380308/559ff8f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/amulet_book_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/18730910048.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/40940690214.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/556042026.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/reading_and_writing_3.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/binebefiliperutewi.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9418/files/importance_of_art_and_craft_in_early_childhood_education.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/toxavonupugod.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/45707460248.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/72334709456.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/bukirogijosirugaxufe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ee2.bin
1e503be0dbb29b0d3f3458496ea7ac979441fa686b32d31ab9205f6e97620457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE2 5444 bytes
font_01_sfnt_off00006160.bin
e5d8253cf4a8a9a7434b60781565c3ea2597f068a423d81c21002994aff6c92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6160 14672 bytes

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