Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f71c50bd075612…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 16:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01ba29e3570189d53fdc31f4f0fae1bf SHA-1: bdeb652f4b48218c38b2d1a1ce73e97c36768b2b SHA-256: a1f71c50bd07561263829370f16490a3e46c151d1479b0e1b7ab8e591a0764e0
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious activity.

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=metabolic+disorders+of+amino+acids+pdf%2529
    • http://files.ishinewithglory.com/uploads/1/3/2/6/132681307/dumarujik.pdf
    • http://files.homeschoolingwhileblack.com/uploads/1/3/1/0/131070618/ruterabo.pdf
    • http://files.elevenbees.com/uploads/1/3/0/9/130969580/5130834.pdf
    • http://files.waterfrontmarysville.com/uploads/1/3/0/8/130814900/1165065.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/associate_cet_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/90479190423.pdf
    • https://cdn.shopify.com/s/files/1/0438/1533/8144/files/kemege.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/65684538561.pdf
    • https://cdn.shopify.com/s/files/1/0431/3104/4007/files/susuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/sopak.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6143/files/how_to_dual_wield_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/seripufite.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/sewewinosemi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2529/9606/files/57001689391.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_off0000606e.bin
37d79c54565887cc9efacbcfb7e9db5af693dff875fca0f5aadeae29d4d4b5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606E 5520 bytes
font_01_sfnt_off00007323.bin
180020bb4109cedb3f4e38e78fc75da3a4b76199580cae1e58f09620058ebdf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 10228 bytes

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