Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf7db562345685…

MALICIOUS

PDF

45.1 KB Created: 2020-08-12 06:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b78aa534b9e5ca9fc1a2edde010d34c SHA-1: 059e2fb52ad23336560faa3e15e10d762f0b1a37 SHA-256: a2cf7db562345685dfcfd6812c6a0fa50a8cb8bcff491385bd7034c1222bfffd
154 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.ru, which is likely used to obscure the final destination of the malicious payload. The document body and embedded links suggest a lure related to academic or informational content to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links points to a link-farming or redirection tactic.

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=6+types+of+probability+sampling+pdf
    • http://files.kurstudios.com/uploads/1/3/2/6/132695432/cf28ed6.pdf
    • http://dewadab.tonguetiepractitionerinkent.com/uploads/1/3/1/3/131383657/4010507.pdf
    • http://files.emgotvhistorywarfare.club/uploads/1/3/1/4/131453605/5212321.pdf
    • http://files.ballaratspine.com.au/uploads/1/3/2/6/132683088/dodimizor.pdf
    • http://palefil.whiterosesociety.com/uploads/1/3/1/3/131379179/44a9da412.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/kagonokanurukamive.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/borivakuburuxodunezuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2279/files/how_to_make_potion_of_harming.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/tenugetixilekilozepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/jetiwawesa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/18426735854.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/katamari_damacy_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0428/5651/3692/files/sopamupoxulagudifoji.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/canciones_infantiles_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0446/4377/8723/files/vafojixunabolejis.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/41360559631.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/mebesob.pdf
    • https://cdn.shopify.com/s/files/1/0439/4500/1115/files/order_to_watch_battlestar_galactica.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_off00007126.bin
e1200d5e06da80c949c8ac784b28b05899da07f2aa77a7a98b59a9379e42968c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 5660 bytes
font_01_sfnt_off0000844c.bin
628a4383ba8e1f7fc83268e48f8675edf910385a1b517fe6b25fed7d5fe8fb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 10276 bytes

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