Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79741661291f861…

MALICIOUS

PDF

45.5 KB Created: 2020-08-03 08:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e70fe8ddb6bd89a345c40461f6a5f59e SHA-1: 3df4612010396840f820c4bab06ecd40fe9ce851 SHA-256: c79741661291f8615c310bd47d6b05344fdb5e789898a7fc7804b33e2f307479
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=nox+player+can%2527+t+type'. This suggests the document is designed to lure users to a potentially harmful website. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, likely for SEO manipulation or to obscure the malicious redirector. 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=nox+player+can%2527+t+type
    • http://files.smfordbooks.com/uploads/1/3/1/4/131438539/2566c535e2.pdf
    • http://files.nuleaflaser.com/uploads/1/3/1/4/131483371/vowirofivimuj-rigoje-bewebavoril.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/domekububenitetasidesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/tirekomijawoxeroworat.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/sivs_manasula_sakthi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2634/files/69778206486.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/45911348602.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/redevozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/4988047420.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/sotiwolegatagiguwixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/10745280258.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/32439299657.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/32060530061.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/zaxolamod.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_off00006885.bin
c50c729b4561d8c55d34b8799fe4124077ebadbbddf6697d0a41cf2c39f56c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6885 4660 bytes
font_01_sfnt_off0000787c.bin
502dfe9b5cc87ba540654751becf67032fe3778a4d7b7301af76fbed9d0f308c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 10128 bytes
font_02_sfnt_off00009b33.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B33 4324 bytes

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