Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a6ba2b02d9033f…

MALICIOUS

PDF

55.2 KB Created: 2020-08-30 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec1dd2e3fb2013cbb4c4fd2de3e2843 SHA-1: e421136596b3d9b021185fb82f2d4755e084e26f SHA-256: 91a6ba2b02d9033f439dba4e7860701af125b862d62ededcfc2110e4cea7a8c1
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of embedded links, suggesting a link farm designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to a popular game, likely to increase click-through rates.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=warframe+foxglove+syandana
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/dictionary_english_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/chief_business_development_officer_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/32411660108.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/definisi_xerostomia.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/rorapimetekog.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/doom_patrol_2019_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/35666264251.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/vatofuzejudogixunofijiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/nba_basketball_live_streaming_1._11_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/gozovovixaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/cutting_and_tailoring_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86526592296.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/rofuwi.pdf
    • https://static.usrfiles.com/ugd/15ebe2_c7e80a16c00b411c9e5126281a643c68.pdf
    • https://static.usrfiles.com/ugd/a59130_533c2c983133471594ced080ac1639ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_337eaea437404630ab88b982952dc62e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e5fd569fe664e948182ac763e234286.pdf
    • https://static.usrfiles.com/ugd/3649d2_6fd54fcb0d204808a424ab562a133e6a.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c53.bin
a3aa6cb676d8a80005d424e5bd4693d61c691150c817c0c6477e14a5c5198739
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C53 5468 bytes
font_01_sfnt_off00009ef5.bin
230399dee89edef10977c8327dff4fe37203d9d0031a7fdeeffa14d7bdff4701
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF5 11032 bytes
font_02_sfnt_off0000c40c.bin
5c95f0f138e6563f3fe05d796e7af5f1b8c38b5c15804eb90b689ff14a672150
pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 2764 bytes