Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f2b6d047501b38…

MALICIOUS

PDF

54.8 KB Created: 2020-08-21 07:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30ac4d2094681d86190fa0a3d03fbe7 SHA-1: 8c1975c28029c6d16cfde7e9287b7bc3a9fe8338 SHA-256: a5f2b6d047501b3800fac4173c3bc382cb4c1b4f156e22dd6174f7c936817267
150 Risk Score

Malware Insights

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

The PDF contains a high density of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=simplifying+algebraic+fractions+worksheet+corbettmaths'. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. No scripts were extracted, but the primary attack pattern involves redirecting the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=simplifying+algebraic+fractions+worksheet+corbettmaths
    • http://sujix.haleyscometrun.com/uploads/1/3/1/0/131069915/tebasadop-zixesofoto-zunonujamu.pdf
    • http://files.jenniestrobel.com/uploads/1/3/1/3/131383959/nines.pdf
    • http://files.authormlhamilton.net/uploads/1/3/0/7/130739814/d2a1d5f75c.pdf
    • http://files.sweetlemonyarn.com.au/uploads/1/3/0/7/130739444/zabigulisu.pdf
    • http://files.firefallseffects.com/uploads/1/3/1/4/131437222/sibetasipejak_guguxowas_vuxisuniwel.pdf
    • https://cdn.shopify.com/s/files/1/0458/2365/6099/files/7045415123.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/usps_flexible_spending_account_claim_form_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9006/files/hozier_piano_sheet_music_work_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/96430933972.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/95866393620.pdf
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/performance_standards_for_antimicrobial_susceptibility_testing_27th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/folukazuvipaluperojot.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/baby_video_songs_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/36033725561.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/national_geographic_magazine_july_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5534/files/rirukoxatedutalesitabe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/mivafivurinolotiwonososer.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/almacenamiento_de_agua_potable.pdf
    • https://cdn.shopify.com/s/files/1/0436/5172/7513/files/brasileirinho_portugus.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_off00008cb7.bin
edf3ff1c13971ab7c352a54f2117918d50577f4ba6fdde65f70742aa387e05a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 5932 bytes
font_01_sfnt_off0000a0d2.bin
86a5129e6f0b37ca3b93da6844f9f09e28e18e0c270b6b2b59c0b1162676a9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D2 14292 bytes

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