Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db299db3924906e…

MALICIOUS

PDF

49.6 KB Created: 2020-08-14 01:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a4980c1641e3f9c3ec0cf5a3d7bad7c SHA-1: 1ea5eae0f86e7efbe63c846a6eaef0cad0a269a3 SHA-256: 7db299db3924906e5ca915f425a094189f41911e5440a3c0ebb2ab30c95b4ea8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is presented in the document body as a job application rejection. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves luring users to malicious infrastructure.

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=absage+f%25C3%25BCr+ein+praktikum+formulieren
    • http://files.drivenbypleasure.com/uploads/1/3/0/7/130740323/cade6d1ed1b4fc.pdf
    • http://files.standrewscathedral.ca/uploads/1/3/1/8/131857756/4fa7c783.pdf
    • http://files.sarahaprea.com/uploads/1/3/1/3/131384171/e66d7851fd12.pdf
    • http://nizaba.procure-ico.eu/uploads/1/3/2/7/132740214/b29eccda7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/10697494699.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/tan_calculus_early_transcendentals_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/fairyland_3_activity_book_vk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/xofugudinokafozipage.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/bedafigupuwovosidek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/32771390974.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4413/files/kibivurasetanur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/wusazuleg.pdf
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/27683289956.pdf
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/download_panda_by_designer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/6760709204.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/64696674909.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_off00006b55.bin
68eb4e14e7720fda81291a0dcc4e859c6f7171abf20ff410d1b38d05e5360fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B55 5532 bytes
font_01_sfnt_off00007ddf.bin
6b8181afbd33a845334f7708a644ce8d9a58d7b6a486d812e79e99b37375e9ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDF 11012 bytes
font_02_sfnt_off0000a23c.bin
018fe7ab8f823a3cb090921c1c485b4b19f8bb00c3f2c8bff27a3b653d2cb391		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA23C 16084 bytes

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