Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0231af2fa6fbfd…

MALICIOUS

PDF

52.6 KB Created: 2020-08-12 03:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf9a592439350ab8f6df2462b8221e6 SHA-1: f5a5210d214caa363adabaffccc7241da76368d0 SHA-256: 4b0231af2fa6fbfdafd023781fdf7e1a1a7ab96cbd5b06f97a49f93ecad3fd01
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external links, with the primary malicious URL being https://ttraff.cc/pify?keyword=definition+of+ms+excel+2020+pdf. The document body contains garbled text, suggesting it's not intended for direct user consumption but rather as a vehicle for these links.

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.cc/pify?keyword=definition+of+ms+excel+2020+pdf
    • http://files.torahfun.us/uploads/1/3/1/6/131636956/3d4122878.pdf
    • http://files.shawlegalservices.com/uploads/1/3/2/7/132741029/jaxijasizu-miromukeveda-tidefako-ladisa.pdf
    • http://files.rockymountainnaturalists.org/uploads/1/3/1/3/131383791/70c110913.pdf
    • http://zapon.doggieandme.com/uploads/1/3/1/4/131452977/midilesogof-videfetufo-bevuvasinadazi-rinaxomuso.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/wevurejis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/41857312083.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/37770195520.pdf
    • https://cdn.shopify.com/s/files/1/0447/2838/5690/files/59722348479.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/mit_press_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/munesoxokonovosufol.pdf
    • https://cdn.shopify.com/s/files/1/0448/2465/8082/files/22295069495.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/2662867056.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/the_battle_of_agincourt_sources_and_interpretations.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/76347792144.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/59674286400.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/gikofibatimipizoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/namatevob.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_off00008f1b.bin
45cd5ca07085464a4ac95a9b1840df95818c05df6fbee09c5dd7014185369e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 5336 bytes
font_01_sfnt_off0000a143.bin
a80e0975732943431ad4db5d37538a4f6914e18c999bd65448ec0be3e5cf4e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA143 10608 bytes

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