Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a283f46c369027…

MALICIOUS

PDF

42.4 KB Created: 2020-07-09 13:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ceb0261ecef432929c51c7437655c9d SHA-1: 85d8f9f871287b06dccdc99f97c816b017e73462 SHA-256: f2a283f46c36902755fc8b73ff9ebe43fd5d88e02048597f981f710324579a06
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a mass of external links, masquerading as search results for technical documents, designed to redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, a known malicious redirector. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, contains the search query and the malicious redirector URL, reinforcing the lure.

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/wb?keyword=gas%20turbine%20design%20book%20pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.templeemanu-el.org/uploads/1/3/0/8/130813851/puwojipoxawafudebere.pdf
    • http://files.pawsforacauseinvitational.com/uploads/1/3/1/4/131438002/2076b15.pdf
    • http://files.ohmog.org/uploads/1/3/1/4/131454272/edb43dc392b6c.pdf
    • http://files.alexstudio.bg/uploads/1/3/1/1/131164448/875fbb5e4c12d5.pdf
    • http://files.wildwva.com/uploads/1/3/0/8/130873903/1645088.pdf
    • http://files.beempoweredmoms.com/uploads/1/3/1/4/131437753/74021b8ded3b07.pdf
    • https://gugemijo.files.wordpress.com/2020/06/javotigumavasiripukiravox.pdf
    • https://zijolaraf.files.wordpress.com/2020/07/jurapupuxatinojodob.pdf
    • https://nakaviditane.files.wordpress.com/2020/06/8545433512.pdf
    • https://rujobule.files.wordpress.com/2020/06/86418354658.pdf
    • https://bexowuxer212851060.files.wordpress.com/2020/07/tadimedodomugiselulor.pdf
    • https://getakoridun.files.wordpress.com/2020/06/21832450743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66691602327.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/galuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.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_off0000672a.bin
f62684120c7b63c11fe016611a4c423b95cfb17393367831ffce6ce0affd775c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5296 bytes
font_01_sfnt_off0000793e.bin
b85a9b896fe4017ac768d08037e4d33ce0aa023bd8a5fc1811464c784fb9efb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 10288 bytes

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