Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee957573f52be59a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 22:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11de8d09d6211bfcb6edd1baf9db8c69 SHA-1: 280eee40e7edcf1579f42ae1fe3ee053b55c7caa SHA-256: ee957573f52be59a73c3d4c8bc787d98f81bebce684a1d3b43df4f91e5960120
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a mass external PDF link farm, with the primary redirector URL being https://ttraff.com/wix?keyword=cash+flow+statement+format+for+construction+project. The document body, though heavily obfuscated, contains references to financial statements and URLs, reinforcing the lure. The presence of numerous Shopify-hosted PDF links suggests an attempt to obscure the malicious redirector by hosting them on seemingly benign platforms.

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/wix?keyword=cash+flow+statement+format+for+construction+project
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/98311960619.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/81556273155.pdf
    • https://cdn.shopify.com/s/files/1/0464/0302/7099/files/pasovel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/18113025230.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/4726479630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/goguzaziwifuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/mofiranofupofulef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/witujafawijukobamefujeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/72490314248.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/tf2_medic_config.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/90310995040.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/mosaremedakipuluvadapeded.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/60180042364.pdf
    • https://cdn.shopify.com/s/files/1/0440/5349/5958/files/48567355734.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bcd.bin
a2f715d1fc29b48912a631b86c1ef7330d9e67906d3ec883d79e8e62e8f980e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCD 5328 bytes
font_01_sfnt_off00007ddb.bin
6db3386d4c9d13277ac1624add99e815190f9579c0eed7af49ba34b5c9c98da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDB 10492 bytes

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