Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb540fa18dd91b74…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 13:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0054546bb6ab7e16c91f8b7b389ddd60 SHA-1: d7e25ec035c358f8367bd55183790de308ce68ab SHA-256: bb540fa18dd91b7480f0f54a7e630d04ef5948494d6f0e14647d8f5ada568251
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, appears to contain keywords related to textbook searches, suggesting a lure. The presence of a malicious redirector link indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting.

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=algebra+2+trig+textbook+mcdougal+littell+pdf
    • http://vavitu.yourchartersoffreedom.com/uploads/1/3/1/6/131636664/baneboja-kesaku-zevepuzijuj-timajumovasewop.pdf
    • http://files.ruthwilkin.com/uploads/1/3/0/8/130814308/0d29c6a0f3701.pdf
    • http://files.reggieschivejazzcamp.com/uploads/1/3/1/8/131856907/2f24492a3d.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/54525698222.pdf
    • https://cdn.shopify.com/s/files/1/0435/9058/2427/files/95195378944.pdf
    • https://cdn.shopify.com/s/files/1/0444/4412/3303/files/bilaspur_university_admit_card_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/wowasixupidogetumada.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/87499334753.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/42446271737.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/beethoven_9th_symphony_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/69648600376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2168/files/94290192511.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6909/files/17353649993.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_off000074d0.bin
f4272bb1708f4f64c2dc5bd7ffb70d29832d883b2a7502bf3f31049adb5f9c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 5688 bytes
font_01_sfnt_off00008819.bin
0c5201f0b6727982d7bb597a4f30c2baf5e6bffcbee2c43974a53c9432a64536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8819 10680 bytes

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