Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12df59d4f5ced1b…

MALICIOUS

PDF

39.8 KB Created: 2020-08-07 09:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b91dc689d28261304ddfad0eb53a75 SHA-1: 9fa2ec6096760504688488c6392930867fb71e52 SHA-256: e12df59d4f5ced1bd278738ad8297879b78c170e9745f4e337a1de8840df7ee9
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The primary malicious URL identified is https://ttraff.cc/pify?keyword=abductive+reasoning+walton+pdf, which is likely used to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, reinforcing the malicious intent.

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=abductive+reasoning+walton+pdf
    • http://gunat.gracechristianvisalia.org/uploads/1/3/0/8/130813042/2709218.pdf
    • http://files.martinsvillesoapworks.com/uploads/1/3/1/4/131407106/6936508.pdf
    • http://files.troutbum.ca/uploads/1/3/0/8/130815277/3497145.pdf
    • http://files.stitchntimesd.com/uploads/1/3/1/6/131606396/xakakidun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/kolile.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/23745465774.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2336/files/ayushman_bharat_scheme_details_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/wezomevilamofumomi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7677/0205/files/pokobobuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3686/files/php_soap_client_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45397061855.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/87655904948.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/6947992672.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/57947045239.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/86975560120.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/85250376109.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_off00005cd2.bin
9b8157cf3e69d59292e89ada02b9e5dd79b5e05b1d6986ee960ad2fa861af0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD2 5604 bytes
font_01_sfnt_off00006fff.bin
73b6178815a981730e38883e91630497d47c8cd43f55f110af4d674cef73406e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFF 10112 bytes