Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbe4f31fad4474d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-12 00:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc21e78556ed84c2ba0388df0d9f479 SHA-1: 78b2aef6aaceb3f9f0d812c67d9494af2414ff65 SHA-256: 7cbe4f31fad4474d7a78133abf3e9e6358e130a85fabd67da3e3dbf0f8c4bd6f
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.ru/pify?keyword=vagabat+gita+bengali+pdf+download'. The document body also contains this URL along with numerous other links to Shopify-hosted PDFs, suggesting a link farm for SEO poisoning or traffic generation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/pify?keyword=vagabat+gita+bengali+pdf+download
    • http://lezufu.silkwoodart.com/uploads/1/3/0/8/130874330/4001752.pdf
    • http://janitaj.bridlewiseridingacademy.com/uploads/1/3/0/7/130775195/7e65e0e5a7.pdf
    • http://zezos.trireflextherapy.com/uploads/1/3/0/7/130776485/litakupag.pdf
    • http://files.yorktown164.org/uploads/1/3/2/7/132740693/41f77c795.pdf
    • http://files.thedimensionart.com/uploads/1/3/1/4/131437531/runozagibivexewuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/62203433158.pdf
    • https://cdn.shopify.com/s/files/1/0436/2744/6435/files/dobowoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/30341777154.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/46re_transmission_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2574/files/air_pollution_causes_and_remedies.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/poxoxoloperenute.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90262961418.pdf
    • https://cdn.shopify.com/s/files/1/0454/5576/9758/files/atomistica_feltre.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/riniguxug.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/buxitonokovid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d9a.bin
b8a731f1f708b4b479611a1b08f5e62f1a123eee2cbda72dc72505215f401010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9A 5132 bytes
font_01_sfnt_off00005f31.bin
e036eb76c4e813fc65d56090d230d492a24ef2c3ffa20679c67eae893e4dc4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F31 8680 bytes
font_02_sfnt_off00007770.bin
40179f56bb5b663a9b1c8b94704510ae4725b6eba4d2a3bb435f42b26d6119a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 9848 bytes
font_03_sfnt_off00009955.bin
a2e640f93cc36f810acfa2b233528f053f32bf2619bf05d19763e230926b9089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9955 3480 bytes

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