Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2f3b9f41dd838e…

MALICIOUS

PDF

58.0 KB Created: 2020-08-28 14:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8754b917fdbb5be41e7145073c6059a4 SHA-1: b41460469b6ea54e3f7da8efd26e808213d020d4 SHA-256: 5f2f3b9f41dd838e2d44c160cdeb6027e33eda94e41222748988238b46c80a70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files, constituting a link farm. One of the primary links directs to a known malicious redirector infrastructure, indicating an attempt to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=sistema+de+capta%25C3%25A7%25C3%25A3o+de+%25C3%25A1gua+superficial
    • http://bafaxip.nehassaiu.com/uploads/1/3/0/7/130775971/jefal.pdf
    • http://files.mora.org/uploads/1/3/1/4/131483307/dc0353ff7608b7b.pdf
    • http://ximadarof.vargassuarezuniversal.com/uploads/1/3/1/4/131453134/guziwivatofi-rixufexuzupilet-fozapekujezikin-retolobewabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3227/9190/files/ayurvedam_telugu_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/bexinegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/65111998518.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/25860811276.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/1976_kawasaki_kz900.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/44125957319.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/viwovopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3905/files/82053680045.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/nigalepazasesiziravonu.pdf
    • https://cdn.shopify.com/s/files/1/0463/4853/3917/files/guidelines_peritoneal_dialysis_infection.pdf
    • https://cdn.shopify.com/s/files/1/0459/9794/9087/files/jibusilejiboluwajogu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009301.bin
519d3271dd944c0368e765322fdefba9e7a72bb0b7bf2ae6787e97d468a44cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 6088 bytes
font_01_sfnt_off0000a63c.bin
6f2c9e5c97c88f2419b64cfb58d136d6ff9e821a3ff4c876fc9e08e671f99e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA63C 12224 bytes
font_02_sfnt_off0000cacb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 4324 bytes

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