Malicious PDF — malware analysis report

Static analysis result for SHA-256 26833eabc03f8cda…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 03:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bbe99bfbc53694ed8651a300a0faff SHA-1: 309e69ab7adf7459d50d29e58104660fbbd4a4d7 SHA-256: 26833eabc03f8cda442685686cce36bc7fb977a0fb330382cc0f777e83a77927
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for 'Alpha blondy psalms 23 mp3 download'. This link, 'https://ttraff.me/wix?keyword=alpha+blondy+psalms+23+mp3+download', is flagged as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to 'static.usrfiles.com'. The ML classifier strongly indicated maliciousness.

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.me/wix?keyword=alpha+blondy+psalms+23+mp3+download
    • https://static.usrfiles.com/ugd/07e02c_2df717fb06e44e78a910d4610869db14.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee1cf382a9e47acaf634a3dbb58835d.pdf
    • https://static.usrfiles.com/ugd/1c90dc_6f7a3fc01de34672b7f4bc8ffb9e8f73.pdf
    • https://static.usrfiles.com/ugd/429b25_daa39115162f44debf0649b7c3e16675.pdf
    • https://static.usrfiles.com/ugd/7baf93_f4fd6d8e0c1a486bbe81040469b8daa6.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/govufol.pdf
    • https://cdn.shopify.com/s/files/1/0462/2106/6393/files/concentration_game_ppt_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/broomstix_rpg.pdf
    • https://static.usrfiles.com/ugd/9c43ec_98e1f3b3ccac4b37ae603e66447f237c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a42262263df4cbd8bf878a3eda5f33c.pdf
    • https://static.usrfiles.com/ugd/b8c837_74fa95b602744448aa61b1252f47909b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb4d1231028042aa8fe9fca92ba0e1e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_86ccced11fbb43c297263fd3ffde4ea9.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/fumosus.pdf
    • https://cdn.shopify.com/s/files/1/0439/7039/6318/files/50910869304.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/14955731935.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_off00004ec7.bin
de9a3c57ad439e94ecadfbd57530326de98f4e319c48e279e73a13f77935d8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC7 5724 bytes
font_01_sfnt_off00006218.bin
a723c9892e69a18d1b3e70194df0436f69cb60018be458461bd7b030e9bca370
pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 10456 bytes