Malicious PDF — malware analysis report

Static analysis result for SHA-256 91243da4c7c4e741…

MALICIOUS

PDF

54.7 KB Created: 2020-09-09 07:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213135ce528a0a274cc7bf63dee0ca79 SHA-1: d8ddec754f223883d0e88074a3bbed9e8972db0d SHA-256: 91243da4c7c4e7414a429361f2be783be0fa60ab69c4660f394cbf7537758a40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.club, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure related to 'winpe boot usb iso'. The presence of numerous external links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely for SEO poisoning or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=winpe+boot+usb+iso
    • https://static.usrfiles.com/ugd/a771bd_0766fab3801b42e7b76811d1a8ded30c.pdf
    • https://static.usrfiles.com/ugd/df73ab_9b2f1acd16074cd8bdf37b3b6c9d971d.pdf
    • https://static.usrfiles.com/ugd/05301a_6335d86b58ee441b8a7e661a6953c5c7.pdf
    • https://static.usrfiles.com/ugd/07ef24_05f70c50e6bc4621851961de3292e61b.pdf
    • https://static.usrfiles.com/ugd/9ec29b_6f336b677226458bb2a250ef69d3eb6d.pdf
    • https://static.usrfiles.com/ugd/b910ae_15c542ed915542ada07f66a52508196c.pdf
    • https://static.usrfiles.com/ugd/735189_ed114b0688e6424a9d231703d77b139c.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_11ba4cc3c7c34f009b4733f9b9a3733a.pdf
    • https://static.usrfiles.com/ugd/0a0016_cd595fd214194b7aa263a569a45fe56d.pdf
    • https://static.usrfiles.com/ugd/185811_654d4eb4780d42faaf6f227d0d70aef0.pdf
    • https://static.usrfiles.com/ugd/b8c837_115051585d174e71acad2c1513252438.pdf
    • https://cdn.shopify.com/s/files/1/0437/5642/1278/files/arnold_toynbee_civilization_on_trial.pdf
    • https://cdn.shopify.com/s/files/1/0440/3838/9925/files/android_kotlin_arraylist_sort.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/6087647775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/5849/5639/files/nadunibudagagodomuxezar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000739a.bin
d48bbcce3d8e057966eacd6e844167d2557bd5137a26dc2f17b50303049c35da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739A 4628 bytes
font_01_sfnt_off00008379.bin
9060b64fd975fb7085bf5c2f624e3fd901dbac67fbcc8849afdbe17021040996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 18432 bytes
font_02_sfnt_off0000b866.bin
4f9bddd8120402856594b33adaeac6aa436e26f5eb63b748bf1666df64cd7ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16340 bytes

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