Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4686911d187e59…

MALICIOUS

PDF

56.4 KB Created: 2020-08-19 02:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 079e40d891358ae0d7ce7f35bbec63bc SHA-1: f0c5ea01b54e4852bdd7a6c3981ecfd3e2cee350 SHA-256: 7e4686911d187e59430d02552f552f366931f0315f384a54ea1838b1e751ccdc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a PDF link farm. One of the primary links points to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

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=spring+resttemplate+post+application_form_urlencoded
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/woreweka.pdf
    • https://cdn.shopify.com/s/files/1/0432/8525/0216/files/79599042733.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/6063631331.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/80048864296.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/67080651386.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/mw3_hack_xbox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/1463637924.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/danumepukixipukukoxud.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/cdf_from_calculator.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_off00009262.bin
11f8bf55fa9e0e31f0526a01939cefd3f132331dbe0bffb7251cf0117b9c17c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 5608 bytes
font_01_sfnt_off0000a564.bin
3c6b88ef66629f1225a3a2cf99bfece5d65cd2a4453a57de31416073e8105c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA564 14928 bytes