Malicious PDF — malware analysis report

Static analysis result for SHA-256 8067f68da5778a88…

MALICIOUS

PDF

33.5 KB Created: 2020-08-19 21:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f4e4914e8b78dd107b75eed5372258 SHA-1: 816677b826608fed0a3af3212dcc0f43f7d5a0df SHA-256: 8067f68da5778a883064137c5405b9115ccaa70844a88352c658952b8d7042bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=comparison+of+equality+exercises+with+answers`. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating the primary purpose is to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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=comparison+of+equality+exercises+with+answers
    • http://files.wearephysicaltherapy.com/uploads/1/3/0/9/130969889/madoguzemum-kasozonafowe-gelizemeke-bejakopalanoda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/29043104395.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/mujonoliji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/16586610063.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/xotoxusavugofij.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/50935974476.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7982/files/can_t_take_my_eyes_off_you_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/kifodazuxasali.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/whistler_hotel_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/17410079139.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/ortopedia_y_traumatologia_silberman_descargar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004386.bin
4cd28f4f1a3aab5915b3f5c0bda76b0dad1bfec852ba14693910df9a9b839e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4386 5548 bytes
font_01_sfnt_off00005650.bin
26016452b713d565c32e46ad6ac9a0265de24ecde36683556e93120c837eb3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 10080 bytes

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