Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7792db08494e65…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4aab4a9557ee9b18b06c783baab1ccc SHA-1: e13d6ad4e10eb44834b2d5d413c66820a0159e4e SHA-256: af7792db08494e65359121c9294def7238806d0328d3f3435ba5358ee130d023
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources hosted on platforms like Shopify and other file-sharing sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=ansys+cfd+post'. The document body, though heavily obfuscated, contains references to 'Ansys cfd post' and 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm. The primary attack pattern involves redirecting users to potentially harmful websites.

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.ru/pify?keyword=ansys+cfd+post
    • http://files.nycmoneymavens.com/uploads/1/3/1/8/131856815/jaxono_tanake.pdf
    • http://files.forceofnaturehandhewnconstruction.ca/uploads/1/3/0/7/130738714/gulumabaneg_jorabumibiroxe_didosiva_nipazakugekil.pdf
    • http://files.unpsoccer.org/uploads/1/3/0/7/130740517/tenejezugaf_wagagate.pdf
    • http://files.yendorearthing-n-wellness.com/uploads/1/3/1/4/131438216/vufibedopiwos.pdf
    • http://kafedos.goldentoadtheatre.com/uploads/1/3/1/4/131453698/b151900b3b294.pdf
    • https://cdn.shopify.com/s/files/1/0436/0493/4814/files/wikujofitowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/rexuzef.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/sitikebasezugobumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/augusto_monterroso_microcuentos.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/kipud.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/70038944269.pdf
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/botw_raw_gourmet_meat.pdf
    • https://cdn.shopify.com/s/files/1/0450/5364/0856/files/electric_circuits_10th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/86957091224.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/wokawupufesexenuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/medical_terminology_for_health_professions_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/bukhari_hadees_tamil_download.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_off0000611a.bin
91984df3d8e96a7348bcd9d2043a35cae8a7761b61535a995378952647980285
pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 4904 bytes
font_01_sfnt_off000071e3.bin
b43deeaead341e34ae84cf2ae301a4a4376d450e92b3bd476eb6833a90747552
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E3 10468 bytes