Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daf31819bae1e59…

MALICIOUS

PDF

71.1 KB Created: 2020-08-04 07:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500ad829146824c81016253f18dcddef SHA-1: 2563203f965751aefb11ebd0042348322d1aabea SHA-256: 6daf31819bae1e59e9327b7c05d6620db9769d2651e590a0afc2ec05e4021202
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, with one prominent link to `ttraff.ru`, identified as malicious redirector infrastructure. The document body, though partially corrupted, includes the same URL, suggesting a lure to a malicious site disguised as a presentation skills PDF. The ML classifier strongly supports the malicious verdict.

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=presentation+skills+pdf+in+gujarati
    • http://files.leapsforlives.org/uploads/1/3/1/4/131412181/325436.pdf
    • http://files.headoverboards.net/uploads/1/3/0/7/130738507/b23ad8b829344.pdf
    • http://files.divinelighttours.com/uploads/1/3/1/4/131483029/800101.pdf
    • http://files.jkenwellstewart.com/uploads/1/3/1/3/131383934/fasazukidokubu-kalub-torasanawonorum-zotafanolajewe.pdf
    • http://files.faerychildcare.ca/uploads/1/3/0/9/130969037/mutizoberojudebuwoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/59880566503.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/42069437923.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/windows_10_optimization_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/79254159960.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/24871997469.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/20102786642.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/tulizuzakakososumuxapez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/22963366505.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/monster_hunter_freedom_unite_monster_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/24981071694.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/vulizadabogu.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_off0000d99d.bin
a42f749474fbc342f45a9a6feca4db9444f142527eb7cc6c7c8b183d1ff831a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 5352 bytes
font_01_sfnt_off0000ebe9.bin
9a7a33cde105a36f9e7d8057121a7166d57fe0a88ff7e93f90521052231e2609		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10392 bytes

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