Malicious PDF — malware analysis report

Static analysis result for SHA-256 555fc02ac864c37c…

MALICIOUS

PDF

50.4 KB Created: 2020-07-28 20:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3b5b109f6936a4a0a27a219cd7a22ae SHA-1: 64a26502f18938be01840bb7ce19cdfb76105748 SHA-256: 555fc02ac864c37c6e92e248f91b0fc784ecca8044ed1d5a8548ac19902bb88c
150 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 pointing to 'ttraff.cc'. Additionally, it exhibits a PDF SEO link farm, with 18 external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of the redirector and link farm strongly suggests a 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.cc/pify?keyword=study+music+alpha+waves
    • http://files.stoneofhopeyouth.org/uploads/1/3/0/7/130775195/0c229479.pdf
    • http://files.rockymtnblueticks.com/uploads/1/3/0/9/130969313/pamugup-wonafiga.pdf
    • http://files.annpopepotter.com/uploads/1/3/1/3/131383733/724557.pdf
    • http://files.jps-page.com/uploads/1/3/0/7/130739369/dipomakezakovu_gadomemogusasem_janafexozunir.pdf
    • http://files.mcclanahanlawoffice.com/uploads/1/3/1/4/131437246/d3e3b.pdf
    • http://files.annpopepotter.com/uploads/1/3/1/3/131383733/724557.pd
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/dadikozewewedamidupev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/91517990300.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/77981062857.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/92154501384.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/tuduzikiligadubunerakefeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/tuvirilumos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/36343807988.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/wukigikadimavaliwitadub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/50956172147.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/47768963618.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/95117579552.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/30295821319.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/19904271581.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_off000087f0.bin
abfe4004001f8774be02536358f218c3335bab5e1ec1ff17192e08d72b6b98f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x87F0 5240 bytes
font_01_sfnt_off000099e0.bin
0cd263e78d9d6067de19ebdfbf24f1efe1bbcaafb9580d564207871ca2582405
pdf-font-stream PDF embedded font (sfnt) at offset 0x99E0 9988 bytes