Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c405d66c37e680c…

MALICIOUS

PDF

74.9 KB Created: 2020-08-31 03:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 872aa7435fa4b2d79c237c9e21c67d8e SHA-1: 353a28deb4b29e3e5f386990f86acffcebce96d1 SHA-256: 6c405d66c37e680c10f68ab9aa93a611f96147d2284ea9b73e3e18f5f5ca94c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical link redirects to a known malicious infrastructure at traff.ru, likely to deliver a secondary payload or phish users. The ML classifier strongly indicates maliciousness, and the document body, though obfuscated, contains the malicious URL.

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.ru/wix?keyword=gta+5+ps4+strategy+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3492/4440/files/34073776460.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45287622464.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/wopomenirusulatin.pdf
    • https://cdn.shopify.com/s/files/1/0427/5883/2294/files/meresamewagarujuririk.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/8975588219.pdf
    • https://static.usrfiles.com/ugd/2c8d66_cb596a2bb2f346d4bf9befbb5eb161d5.pdf
    • https://static.usrfiles.com/ugd/99afdc_4786a8155e5544acb33feacf0de6a2fd.pdf
    • https://static.usrfiles.com/ugd/eed56f_256eddbed5504582b65a62d19a6bb750.pdf
    • https://static.usrfiles.com/ugd/8b9728_98adca4d9d774c2eb40def9b88fbc2fa.pdf
    • https://static.usrfiles.com/ugd/f46427_0e7370a50f5449e583a4f384d6278b9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f941783ff54948925393a1e465d837.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0382f1784b574ed6aa54fec793b727b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/c3f88d_077ead4b5e0342d6878da02ce8e5bb37.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_off0000e522.bin
61b04679cead88feeda7ce4755cce12d68d0d50af2d415b09a62a7267dfcfaa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5440 bytes
font_01_sfnt_off0000f7c5.bin
4c83bfdf306e5ee3f0417728091c04ecc9060209004cb456641e6bdddf46af20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 11992 bytes