Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a65f40669ca9e1…

MALICIOUS

PDF

64.3 KB Created: 2020-08-14 23:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a51d5ef231b24eac9666a1889dd41535 SHA-1: fec44cd6849ad2f08f75ac03b3353185120517f6 SHA-256: 67a65f40669ca9e1acd51599f77150d0e494bffdc39ec7a765e5cb64c513a8c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is part of a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The ML classifier also 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.com/pify?keyword=cfa+financial+reporting+and+analysis+syllabus
    • http://files.ahhs2020.com/uploads/1/3/1/4/131408930/ce4bd1e0098e.pdf
    • http://files.adventuregirlsnj.com/uploads/1/3/0/8/130814900/beramusawajar.pdf
    • http://nelotono.thetechnicolorsheep.com/uploads/1/3/2/6/132682883/lidisukage_nuwagorakupowob_juzafa.pdf
    • http://files.theallstarsgroup.com/uploads/1/3/0/7/130776037/puxabebotuz.pdf
    • http://files.cateringbykatherine.com/uploads/1/3/1/1/131163601/fasolaxoxigep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/5503674165.pdf
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/moonwalker_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/lufojixajuge.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/biludimupamimajuzil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/blood_on_the_moon_the_assassination_of_abraham_lincoln.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/merenexup.pdf
    • https://cdn.shopify.com/s/files/1/0440/5942/6968/files/american_eagle_return_policy.pdf
    • https://cdn.shopify.com/s/files/1/0444/1836/7654/files/epigenetic_modification.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/20535065022.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_off0000bd90.bin
4f300ff1b58919e07c3a729d25606d5d438f4b2068daa7f45e8c254824f9675e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 5472 bytes
font_01_sfnt_off0000d030.bin
812d2dd37f87e3f1b77caf196f1f83180a6329c2a9d31c0c63fb7deecc9b646a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 10504 bytes