Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f389b3349e780f…

MALICIOUS

PDF

51.7 KB Created: 2020-08-06 21:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed55a6986057eb5fa87775bb1a4793b SHA-1: e2feeeff2945cf475077046c86582fdc27274dcf SHA-256: 86f389b3349e780fdd5d279e1e455ccc8e88274fce2b186f31dc4eabf7d4b8a3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=vit+b12+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector URL is the primary indicator of compromise.

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=vit+b12+pdf
    • http://files.alabama-lera.com/uploads/1/3/2/7/132740743/6abfd6e75b.pdf
    • http://files.discountfootballshirtframing.net/uploads/1/3/1/3/131381231/dibujisinoxut.pdf
    • http://files.dog-gonefancy.com/uploads/1/3/2/3/132302919/1744867.pdf
    • http://files.annasalimon.com/uploads/1/3/0/8/130813489/vukuvut_zijasudovig_dogekapekud_basefo.pdf
    • http://files.conniecrowe.com/uploads/1/3/0/8/130874064/d8dec26087.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/ripozekeleveriki.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/64536420561.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/cateye_strada_cadence_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/36070831738.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1063/files/sologavumajor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/25637478782.pdf
    • https://cdn.shopify.com/s/files/1/0439/2311/2104/files/wuduketufogote.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/98338869922.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/10681178196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/xifepanelatufipavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/sajedipuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/gitaxo.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_off00008ed7.bin
3d6d89fe18b719bfcfe930eecb75a82ff1cc65fab934e3f105be6f3292643a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED7 4808 bytes
font_01_sfnt_off00009f59.bin
019e9f9380067b13c8f5a7776666be31473b03ed3dead17f6c5f5ba1fc989142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F59 10144 bytes

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