Malicious PDF — malware analysis report

Static analysis result for SHA-256 40580141dc9915d2…

MALICIOUS

PDF

47.4 KB Created: 2020-08-06 23:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391e53d5b219884646015ce669b1834b SHA-1: 7f9a083eb75966049cb849b66b19f0c8cd1f2125 SHA-256: 40580141dc9915d2534d6f43dbc8bf28afae7008d2c8b74d7952af563be27686
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, which is further supported by the ML classifier's high confidence score. The document body, though partially corrupted, contains text that appears to be a lure for a 'verb noun adjective and adverb list pdf'. The primary malicious IOC is the redirector URL, which is designed to lead users to harmful content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=verb+noun+adjective+and+adverb+list+pdf
    • http://lanalem.serenityfarm.org/uploads/1/3/1/8/131856584/vuvuwepujo_sekelijewadon.pdf
    • http://files.moosalamooultra.com/uploads/1/3/0/8/130814345/7037637.pdf
    • http://files.allazoleadership.com/uploads/1/3/2/6/132695321/tozozu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9794/files/ayushman_bharat_hospital_list_in_up.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2085/files/chemistry_and_chemical_reactivity_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/variable_displacement_axial_piston_pump.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/xinunabaju.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/lagiwojexilakux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/86434716037.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/kebazomulimeno.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/77971468889.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/63405348965.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/32518735011.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6965/3663/files/72184020755.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_off0000714e.bin
0076cff3ca1141647f82007720cc0401bb3eedd35a6d4aba09f8c37f49c60247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 5388 bytes
font_01_sfnt_off000083bc.bin
674b132fa162088136b1c20a76fa2838ff6abeb184de750ef60f289b1dbdff3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BC 14272 bytes

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