Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa83502b40ae9ebe…

MALICIOUS

PDF

40.0 KB Created: 2020-08-10 07:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd830f4d8568726c13469b2d625f4ab1 SHA-1: 34d7b33069a0c2f6369bd5a5e63465f360da4b95 SHA-256: aa83502b40ae9ebe3adc2f19c22cd49e8bad4f69b1c5aed776d64e0d3e38f4fb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The document body, though heavily obfuscated, contains text related to 'surface area of prisms and pyramids worksheet answers pdf' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=surface+area+of+prisms+and+pyramids+worksheet+answers+pdf
    • http://jufisas.drdmwilson.com/uploads/1/3/0/9/130969742/1c5fa8091.pdf
    • http://files.wickfordbowlingclub.com/uploads/1/3/1/4/131453698/razebutox_rumapetudin_kozedozetedo_gulabumubupaj.pdf
    • http://files.shoprivervalley.com/uploads/1/3/2/6/132681398/renafugorozukug.pdf
    • http://files.stormtrooperblaster.com/uploads/1/3/1/4/131453682/54c464ecd.pdf
    • http://files.abgillinois.com/uploads/1/3/2/6/132682070/vunedubabovu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/73688664510.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/gigugusuradifoxeranixasok.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/savesqlite_airlines_airline_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/nuvifamasupabuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/75334457305.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/15924714326.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/yokohama_conveyor_belt_catalogue_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/multivariable_calculus_james_stewart_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/data_analysis_open_source_tools.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/85661621119.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/marudiboxumoxat.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_off00005c98.bin
fadc638d007b3afbf9f97b38e3f2184e0182e057ba45b9a0b0888f7cb2d64175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C98 5724 bytes
font_01_sfnt_off00007004.bin
d822977c0e1449f8d06180be98a012bda1de1e9e867a29d3ffe1de4fe6c43f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7004 10204 bytes

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