Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9b5e7f01d73089…

MALICIOUS

PDF

36.3 KB Created: 2020-08-13 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b80d766a763ebcaca52bf53830da81ed SHA-1: f37ba59ba8c4a4ab6ffe6670597f30861a4feeea SHA-256: cb9b5e7f01d73089190866cd0df42ecf6e8848aadcffb69c9c3a4bd787199b6d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the attack. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure related to 'monohybrid genetics problems worksheet key'. The ML classifier also strongly indicated maliciousness.

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=monohybrid+genetics+problems+worksheet+key
    • http://tukedu.victoriaho.com/uploads/1/3/2/8/132814930/simigipemafug-zegibako-kuselukok.pdf
    • http://lutatega.cocoaandspice.com/uploads/1/3/1/4/131438428/b8f2e969d06282.pdf
    • http://files.skinsationalbylaura.com/uploads/1/3/1/4/131453124/gijexobakir.pdf
    • http://files.helenemillscenter.org/uploads/1/3/1/8/131871618/sujob.pdf
    • http://files.jasminesmetalart.com/uploads/1/3/2/3/132303315/4577985.pdf
    • https://cdn.shopify.com/s/files/1/0434/6232/8472/files/76613428600.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/janitrol_furnace_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/12918997341.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/niwuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/rukaperamufuge.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/effects_of_deforestation_on_biodiversity.pdf
    • https://cdn.shopify.com/s/files/1/0435/4506/7684/files/maxazemomebajifebazukalil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/75383269787.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magizokoluredofet.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_off00004d9a.bin
8fd7ba96463402816a222446b874597e4af92a90d3c75bae32267f70bfef1f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9A 5680 bytes
font_01_sfnt_off000060eb.bin
f6ff1b0e9cc430b867872d342e5c57c9b8b91a84e8d977eca0f357764725311c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 10360 bytes

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