Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dd599e2befe0d3…

MALICIOUS

PDF

50.8 KB Created: 2020-08-04 13:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e623872264075eeed414f08778869fb SHA-1: 751662c96bcfee6b74b54b52566489bc126915e1 SHA-256: f7dd599e2befe0d375e95f7c5b7be9443f0309938139c6c2fa8e766c6a2a74c9
152 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.com/pify?keyword=auf+kindle+pdf+lesen'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the redirection attempt.

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.com/pify?keyword=auf+kindle+pdf+lesen
    • http://files.dairymaidnb.com/uploads/1/3/1/4/131406592/fb787a4ff88.pdf
    • http://files.artworldschool.com/uploads/1/3/1/3/131382721/roxekadigusovo_sorokop_furigukon.pdf
    • http://files.mansfielddetoursscooterclub.com/uploads/1/3/0/9/130969403/vujepozinimuzuzibop.pdf
    • http://mokotene.arieschakrahealing.com/uploads/1/3/0/7/130776728/vibogomasogekafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/20978838617.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/rurigajimefut.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/livro_de_administrao_financeira_e_oramentria_para_concursos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/40573906106.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/riwonutosodozasepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/permanent_product_recording.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/guxuwolafusukogakagov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/202_870_5858.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/raxadimiladusexatopame.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_off000086a4.bin
31e15804ec5170a24b1d732cdef824d13185d8141b1fbc8a6212636bfb915992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A4 4784 bytes
font_01_sfnt_off0000970a.bin
b3bfb8c9ad65150374069c01b3afe7f9d822c468ac966527a82474fd231eaf79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 12424 bytes

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