Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c0c83b0bd90d2f…

MALICIOUS

PDF

37.1 KB Created: 2020-08-19 08:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a61badfbd3d1d7e06257ed1278934f SHA-1: f225daddf7e82ae26cdb30a585d83c6695062f4a SHA-256: 11c0c83b0bd90d2f868952e9b4865b9b78f5b7a05355e0fe782d6abaa1be5b5b
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 of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links, https://ttraff.ru/pify?keyword=business+plan+format+word+document, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=business+plan+format+word+document
    • http://files.cornfieldcouture.com/uploads/1/3/0/7/130776110/6416018.pdf
    • http://files.nationalhorselovers.com/uploads/1/3/1/3/131397987/zigazaluwatuw-lekobisulezegam-fekikumebewu.pdf
    • http://files.wlcbands.com/uploads/1/3/1/1/131163931/2921846.pdf
    • http://files.rainbarrelalaska.com/uploads/1/3/1/4/131482941/6206474.pdf
    • http://files.blackpeakstudio.com/uploads/1/3/0/7/130739718/75690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6483/5737/files/jcb_3dx_working_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/lutofujijuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9988/1639/files/giwebexuniborijesof.pdf
    • https://cdn.shopify.com/s/files/1/0428/3390/3783/files/lokuwanoruweninelofofiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/42387277172.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/vadatigobazafo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2529/files/4227400251.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/nostra_aetate_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/83260429478.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/gotanerupifovirow.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_off00005376.bin
34995f6155c26b8dc9255d3b91627df524094a7b034e5e88a938734882715d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5376 5444 bytes
font_01_sfnt_off000065eb.bin
17262a640fc5065eaecd3acbe87722639e07fa77118a58139916ceb07e6615ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 10008 bytes

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