Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4d6e969f2c0c7a…

MALICIOUS

PDF

119.4 KB Created: 2020-08-07 23:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7c529a1b66bdf64e3c1a6fad242b41 SHA-1: 81b582355507d31cdb845cfbee418b6055f7c694 SHA-256: db4d6e969f2c0c7a477fcc15615c8e8b7bccee403ba0245d9a150c0c514cd898
152 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 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on Shopify, suggesting an attempt to game search engine results for potentially malicious downloads. The ML classifier also strongly indicated maliciousness. The embedded URL in the document body, 'https://ttraff.com/pify?keyword=icao+annex+11+pdf+download', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=icao+annex+11+pdf+download
    • http://files.theyogafixbook.com/uploads/1/3/1/4/131454521/4613060.pdf
    • http://mogigope.daviddriffilldesign.com/uploads/1/3/2/6/132681504/90e20.pdf
    • http://files.mrsbelindamiller.com/uploads/1/3/1/8/131857847/toduw.pdf
    • http://files.3bbabyblankets.com/uploads/1/3/2/6/132681545/jefilikividoxixamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/74793088426.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/quimica_inorganica_nomenclatura.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/zedalorekaketifufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/simple_past_exercises_esl_library.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/23548497870.pdf
    • https://cdn.shopify.com/s/files/1/0432/2040/2337/files/15343352754.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/57785738976.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/95162499276.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/mogusitudesonusewotil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/naca_airfoil_data.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/oxford_bookworms_factfiles_recycling.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/76483811718.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_off00019d01.bin
31093285fbeeb21cb227af3b2d38e86cb4595cd892f4f290b33f73f2e6eb4e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D01 5024 bytes
font_01_sfnt_off0001ae53.bin
a8b5828b01b18d744eb0b76aabf4122b58250c3f135f49c9a551247c7ec8aa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE53 9980 bytes

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