Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7c0c770273a783…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 08:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1911ad0845a1724a9491d93e932c85e1 SHA-1: 59d271b11181ad94242699241f7e0b001c188d4d SHA-256: ff7c0c770273a7838047d5aa66285d82574cc343aa003b13a6b08404b656b779
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the text 'thyroidectomy procedure pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=thyroidectomy+procedure+pdf
    • http://files.cosybedsandburrows.com/uploads/1/3/1/1/131164542/fonepumimos-dasofuvuka-japigusi-merebadojo.pdf
    • http://files.mohicounseling.com/uploads/1/3/1/3/131381612/8205687.pdf
    • http://files.pablofernandezpt.com/uploads/1/3/1/4/131452939/fepexadiriliv.pdf
    • http://files.plateauartsalive.org/uploads/1/3/0/7/130775888/9933472.pdf
    • http://files.charlescotebouchard.com/uploads/1/3/2/6/132695278/c222bd77af4a4.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/49527925740.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/89297266451.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/fazixidawijesazupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/kawosakilirugulesalagas.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/60099003131.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/kezupefubufotorewoxobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/dumagidexazexazugifusiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/63767968946.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/nekekewitanezavasimuzoxun.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/42841982294.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/69378226346.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_off00007288.bin
88f1d960321cebaf43c7a178ea9902b50481b1f9a8c0894f393f271d4f8cceba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7288 5028 bytes
font_01_sfnt_off00008383.bin
eda29dc3bc75d771035fbcec9b44076ae8dd26c616155ab8ad54b9161b79cd74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 10220 bytes

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