Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d1185cbafa2e36…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 19:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a65ae5506fcddb046e956d2021e10a SHA-1: 4efe024360dac9023d6b6cf1fcaa43c108c682be SHA-256: 88d1185cbafa2e36dd81c8665c2dc6f63fb84781c330de4651e8077ec96a76e5
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a link farm with numerous external PDF links, with the primary suspicious URL being ttraff.com. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=guides+uniform+shop
    • http://files.emilyjholland.com/uploads/1/3/0/9/130969083/4d6907071.pdf
    • http://files.intervarsity4corners.org/uploads/1/3/1/0/131070792/linusumojivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/rutelebosesubutosaluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/writing_and_solving_algebraic_equations.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/biblical_names_and_their_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/wigagoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/how_to_open_steam_game_files.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/borges_library_of_babel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/frases_basicas_en_ingles_y_su_pronunciacion.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/botixeji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/sidadagekuwujezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/9895726268.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_off00005d30.bin
7af35faf8a5119349fbe6d5b5baeaf7862464d45936e9a2180fcd4be36a7d871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 5068 bytes
font_01_sfnt_off00006e44.bin
f6151b11692b99d12a11e7bdb5645d0206a4591c2b8591659b8bec06f74a0e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E44 15236 bytes

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