Malicious PDF — malware analysis report

Static analysis result for SHA-256 114a9a9ff47ce8b5…

MALICIOUS

PDF

53.7 KB Created: 2020-08-18 20:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce466439e8fcebf79a03d046631ced68 SHA-1: c45b5770b53c19ad366df52d4e3932cfb94c9985 SHA-256: 114a9a9ff47ce8b50cb7303b4d051143dbb105b70275494bf2a05ebab0c7147e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a salary guide. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly indicate an attempt to lure users to malicious sites.

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=atrium+staffing+salary+guide
    • http://xobedofan.officesonthego.com/uploads/1/3/0/7/130775085/widutid.pdf
    • http://files.coloradoartclass.org/uploads/1/3/1/6/131606690/52b70da5dd3d4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/56912716439.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/44261062883.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/sears_craftsman_snowblower.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/wordly_wise_book_7_lesson_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/87003595476.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/24992208955.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/18263060647.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/17373281443.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/coco_bistro_menu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/pelufuzemevezovusunix.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/minecraft_launch_options.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007225.bin
e3d21e26a79365c8baea5e309ba36c7c6914915bfaec601659f38104f29a861f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7225 5316 bytes
font_01_sfnt_off00008427.bin
14e5718f92f0c97a2284c33ba08bf74a89fe3ec54d8a1bbc15c69ead8513eebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8427 15736 bytes
font_02_sfnt_off0000b48d.bin
9210f4d56a2d0e868c92c8f3d69665b65103c4cbe8eccb0746292756ebfacc8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 16148 bytes

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