Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afba2ba30429097…

MALICIOUS

PDF

76.8 KB Created: 2020-08-31 05:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5932eaf3c5bfeb47c874a327fc0e23f SHA-1: 122e246fbeea48f388cf4178669d7e1c8fdf3478 SHA-256: 4afba2ba3042909776d9385fa3126d8eaf20e4d0ae8a33be1215d8ad44ea75ad
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=aws+devops+certification+study+guide'. This URL is presented within the document body, disguised as a study guide, to entice users into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed for SEO manipulation to distribute malicious content. 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/wix?keyword=aws+devops+certification+study+guide
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/aci_315.pdf
    • https://cdn.shopify.com/s/files/1/0443/8360/0806/files/regimento_de_assembleia_nacional_popular_da_guine_bissau.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/34597157031.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/organic_chemistry_mcmurry_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/fafigogakuxejawefenazefij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/pobubud.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/beginner_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/papogile.pdf
    • https://cdn.shopify.com/s/files/1/0445/5255/2612/files/definition_of_sustainable_development.pdf
    • https://cdn.shopify.com/s/files/1/0459/9912/8735/files/bijube.pdf
    • https://static.usrfiles.com/ugd/a01749_bedbf92d28ee45cd95b86c96a0dee31d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b52de928a3dc467795c003702e94c2be.pdf
    • https://static.usrfiles.com/ugd/bf07b1_403fa9049ed64c9092211a9cb742e849.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9445/files/medicare_guidelines_for_bariatric_surgery_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/89143156725.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_off0000ac55.bin
ebd2e349c97689014d38de8ce4c5919ce2f572313c707362210d0407c5827f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC55 5532 bytes
font_01_sfnt_off0000bf4e.bin
950da9d5354e516657071861684b6d9e752fee9e2a53fddc8445811a62c63e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4E 14140 bytes
font_02_sfnt_off0000e8fc.bin
b09f5e8ac45a61c64409238cc7eb16ca3007d696d932615f126dae9ccfba068d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 10936 bytes
font_03_sfnt_off00010e91.bin
11661061d91a97eae522d6003a27cb04ef09dc6057acc40cda66d98a4406a668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 16716 bytes

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