Malicious PDF — malware analysis report

Static analysis result for SHA-256 2766c0b7aaa2b8e9…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 07:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16fad166c875e24a5c040498b1d49edd SHA-1: 7c6474b644ae75326ac69fcfe8447bec2a8412a9 SHA-256: 2766c0b7aaa2b8e98ef7e03cd04c19ef93515846ed8802c9e4e9c58cc2e22c34
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=juicios+a+priori+y+a+posteriori+pdf', points to a known malicious redirector. The document also exhibits characteristics of a PDF link farm, with 16 external PDF links, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=juicios+a+priori+y+a+posteriori+pdf
    • http://files.entreepartyband.com/uploads/1/3/1/6/131636927/092fe573ee7a28e.pdf
    • http://files.twistedoakandco.com/uploads/1/3/0/8/130874615/dotekutivaxuki.pdf
    • http://zomiras.pholmes-iplaw.com/uploads/1/3/2/3/132303382/7271205.pdf
    • http://files.eleatdiningclub.com/uploads/1/3/1/6/131607310/f48dda41005ab34.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/muwamizibexokelugi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/kathem_al_saher.pdf
    • https://cdn.shopify.com/s/files/1/0437/7133/0709/files/adobe_failed_to_connect_to_dde_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/95678847985.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/xexujubosevedirozise.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/socialismo_utopico.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/wuzojuvop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/rarutorepowekotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/framed_ink_drawing_and_composition.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/xenujafemapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9974/1596/files/30915932494.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/35345139703.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_off00005c65.bin
76a8987101114d7c1985c0bbe82db45e2deadb97e7846caece5c6bd2fd58e5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 5208 bytes
font_01_sfnt_off00006e35.bin
3b9c0c131b579a50dba73602dd2f34595b0dbe3bca728002fa2b59cf5dcc499d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 10936 bytes

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