Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5dcb1639991893…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 12:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c398139f4bad5931e7d12a6b73cbd94 SHA-1: 318a4b73ab53d892294941ecc675839f270653ac SHA-256: 2a5dcb1639991893dc081e660e00bb04f4166038309438c5de621bf9ad4e198e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=amd+ati+4800+drivers'. The document body, though heavily obfuscated, contains text related to 'Amd ati 4800 drivers', suggesting a lure for users seeking these drivers. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning to increase visibility of the malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=amd+ati+4800+drivers
    • https://static.usrfiles.com/ugd/b8c837_777f775b845b4d4dacec14420ea13f7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_557249ec494e4881a9f2d85c22145eb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_25b76b8913af41ba9aa31f09db1fbf9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_583313f13a004833a69252c5310ad09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36d9949354433ca8684a5763695c9d.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/android_one_update_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/dudev.pdf
    • https://cdn.shopify.com/s/files/1/0461/9704/7447/files/angular_6_interview_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/xejanejokedaliwiwajozez.pdf
    • https://cdn.shopify.com/s/files/1/0439/1193/8216/files/88167266772.pdf
    • https://cdn.shopify.com/s/files/1/0459/2356/5717/files/mpsc_group_c_2018_pre_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/fimeritemabapasujojafe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/super_mario_world_gba_rom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/diablo_3_enchantress.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/zatatalosuwit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/ruwazowibivema.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/35485998445.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_off00004aef.bin
f9fbd4ce1d18b42bf9383688efe175a4cf7b3c7d3a4e214d1dc3f299f227ca38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AEF 5412 bytes
font_01_sfnt_off00005d42.bin
aa46aace02268bcddc665bc16c3c69ede5ffbebd9975e5e781394bc8fc40ff9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 10080 bytes

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