Malicious PDF — malware analysis report

Static analysis result for SHA-256 21035ebd9e3342c8…

MALICIOUS

PDF

56.6 KB Created: 2020-08-05 09:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a954a2fd6b87e0f24e02fc2904c1f1 SHA-1: 3d42219caf89d17dee7bf2674425c6c88ccfc828 SHA-256: 21035ebd9e3342c8716f6940060a5ff25385dc651ea244f66a9dcd2d6b52b5e1
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a link to a scientific PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the embedded URL points to a known malicious redirector. The PDF also contains a link farm, as indicated by PDF_SEO_LINK_FARM, which is a common tactic for SEO poisoning to drive traffic to malicious sites. 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.cc/pify?keyword=pdf+biocalculus+calculus+probability+and+statistics+for+the+life+sciences
    • http://files.thenateco.com/uploads/1/3/1/3/131382141/tapumekutemesuzujut.pdf
    • http://files.craftcoop.co.uk/uploads/1/3/0/7/130774993/50902a260.pdf
    • http://files.omgyummy.com.au/uploads/1/3/1/0/131070918/fesegizi_guguxaweru_xatagez.pdf
    • https://cdn.shopify.com/s/files/1/0432/4648/5672/files/30053230002.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/5923234791.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/71880338027.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/jurarusupepekor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/3rd_eye_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/65776994703.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/mamax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/zivowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/koramuware.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/what_is_an_example_of_sophistry.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/66681987125.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/zolukapugojusageretawa.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/1/0431/4929/5776/files/zivowo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009419.bin
4ab3bdcaa81ec11e60c3968931a9fe6db70f63c73632be2e671424eb30d62d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 5484 bytes
font_01_sfnt_off0000a6bb.bin
bd333632fcc04829218e47e4bdb85d3bb4044c9ffa81b2c00fc4615b22b4c39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BB 14748 bytes

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