Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d24f5b4988d4924…

MALICIOUS

PDF

36.4 KB Created: 2020-08-27 12:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8887ae4604c7aa9c7e7e34b20ea90c2 SHA-1: e99db2ddccd9b269d0bd270e83b1ee783cb93c49 SHA-256: 6d24f5b4988d4924608db1c5fd6a96b5bb33f1c08b54c856ddb9bae7e8c18edd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document also features a large number of embedded links to external PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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/pify?keyword=house+of+kolor+manual
    • http://xobuxo.primarytackle.com/uploads/1/3/1/0/131070571/dagogopu.pdf
    • http://zirevi.cbwilsondesign.com/uploads/1/3/1/4/131406893/xivonuj_budamewuxaj_luninune.pdf
    • http://files.developingbrain.ca/uploads/1/3/1/3/131380480/8bf2d13d27.pdf
    • http://kixalol.sub-culture.store/uploads/1/3/1/4/131482952/1391400.pdf
    • http://kofazu.lyndhurstarttrail.com/uploads/1/3/0/9/130969061/4d8593eb8a33d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8245/6981/files/zebadidofirazetavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/94141543106.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/gumofaneren.pdf
    • https://cdn.shopify.com/s/files/1/0434/4804/1637/files/76152761509.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/endnote_x7_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/3311/5289/files/890258373.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/formula_of_mean_median_mode.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/aalala_kanda_hd_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/89595528856.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/ramuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/79032479162.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/buffalo_wings_and_rings_menu.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_off000050ed.bin
12855d99ee1b764daf70e67e5873a1f880d6554191a19d8d5dd9d576360a4e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50ED 4936 bytes
font_01_sfnt_off0000619a.bin
2c095cef561cb19abb2c6c81dc7434024b76fa519e0016b97ffe90e5877de44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 10392 bytes

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