Malicious PDF — malware analysis report

Static analysis result for SHA-256 f904da7bf3a604c5…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 17:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf41dc3f76ac6197097dee11da156d6 SHA-1: f25021775feb981a0723b11091be32a108a21a8b SHA-256: f904da7bf3a604c5e74390b837f61c01a4aed00395f0e3f48d4ba0b4eadba801
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a "Beginner piano book for adults pdf" to lure users. The primary malicious link, https://ttraff.ru/pify?keyword=beginner+piano+book+for+adults+pdf, redirects to further infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a social engineering attack.

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=beginner+piano+book+for+adults+pdf
    • http://zupifut.kirbyonpolitics.com/uploads/1/3/0/8/130813420/5709993.pdf
    • http://files.luminoushealingtouch.com/uploads/1/3/1/3/131383892/1189979.pdf
    • http://files.escaperoomelectronics.com/uploads/1/3/1/6/131606807/bumexupa.pdf
    • http://jigixoren.caylarsamano.com/uploads/1/3/1/4/131453267/9d58dc0f7c1.pdf
    • http://files.hrv4training.com/uploads/1/3/2/3/132302718/napus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/zusiwisafabemakakezajoma.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/20505783767.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/90962896586.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/nekijep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/zurujikozekigisid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/44959067035.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/dedosegivuvutoxenumu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/jorikus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/67513010126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/22754037663.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/public_finance_notes.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_off00006efa.bin
5ea37b4d35b254124107ccdf7c371dabc3eb02360a905837a284e1faab6ec75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFA 5464 bytes
font_01_sfnt_off0000819f.bin
2558911bc8ace867ccad6164acf0632fc422802ae1d68d2157f4e8590d0ef3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 10024 bytes

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