Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedb54236c94a633…

MALICIOUS

PDF

49.0 KB Created: 2020-08-08 13:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd611f8beba97322345bd10b92d61899 SHA-1: 6599ce4bec250bd7d1e51f0680aca99b861e2e82 SHA-256: aedb54236c94a633adfbb1a7765e4f8c67a8672748352fefed8d95ef3c853c65
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/wb?keyword=research%20methodology%20approach%20pdf`. The document body itself is heavily obfuscated and contains this same redirector URL, suggesting the primary purpose is to drive traffic to malicious infrastructure.

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/wb?keyword=research%20methodology%20approach%20pdf
    • http://files.sophiemargolin.com/uploads/1/3/0/7/130775032/faninapisevikezasul.pdf
    • http://files.americasbluesmovie.com/uploads/1/3/0/7/130739789/folujewujagobax_sizijesojojimoj_ruluwuwepe.pdf
    • http://files.kwingard.com/uploads/1/3/1/4/131452838/0d8001ae41cd43.pdf
    • http://files.roughridernews.org/uploads/1/3/0/7/130739122/jawub-gasenowuro-wadenidero-zevek.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/66330352979.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/24697032892.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/8902147599.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/21670937378.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/utorrent_download_windows.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/html_background_image_full_screen.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/71447170309.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/pifemugavedefogasovene.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/electrical_engineering_mcq_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/68937553075.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_off00008095.bin
c8d94a34200d80182da86fa9f2a800eddd80a07b77ca9dee688bcd91d88e7c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8095 5680 bytes
font_01_sfnt_off000093cc.bin
14b5952c9fa021bde2eeebb4a51909603c271fdfa90c2de3da81436966bca68d
pdf-font-stream PDF embedded font (sfnt) at offset 0x93CC 10312 bytes