Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e842a1a3751ff5e…

MALICIOUS

PDF

45.2 KB Created: 2020-08-11 18:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116f154ffb915af5d379651a7b29ded9 SHA-1: c39759e9017b4d363ffe0db3aacbd8031cfbc5fc SHA-256: 8e842a1a3751ff5e86375c0d855d7491b7a85b162af2b3cfc8223aecd8cdf0fe
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous links, many of which lead to benign Shopify domains but are likely part of a broader SEO manipulation scheme to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be luring users to click on these links, which likely lead to further malicious payloads or phishing sites.

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.com/pify?keyword=sinusite+maxillaire+d+origine+dentaire+pdf
    • http://files.acomputerconsultant.com/uploads/1/3/0/9/130969511/3630881.pdf
    • http://kurulana.chokeyuanteng.com/uploads/1/3/1/3/131383314/4771776.pdf
    • http://files.mprints.us/uploads/1/3/1/3/131384335/wesogoferemex.pdf
    • http://sajejo.heidispiritmedium.com/uploads/1/3/0/7/130775934/708a7.pdf
    • http://files.haggartbelting.com/uploads/1/3/0/7/130739340/d1af7c46179b0.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/beginner_headway.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/wesuxelaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/paula_abdul_cold_hearted_snake.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/38641305168.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/39902058271.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/buduma_fundamentals_of_deep_learning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9704/7718/files/rebij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/syllable_structure_processes.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/zukomujuwuno.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/arcanum_of_steamworks_and_magick_obscura_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/advanced_excel_course_free_download.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_off00006ded.bin
76fcda8895dd3ad3acb2973ac7c21750e71fc8ee1eb8a231efbe7f0ae9a0e593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DED 5532 bytes
font_01_sfnt_off000080a4.bin
0e53b2e19569df889117676fb65a5da5e0b79978cb7c7b5b8fe72b6c3d7dfe41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 11868 bytes

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