Malicious PDF — malware analysis report

Static analysis result for SHA-256 67de73e825f5b5ec…

MALICIOUS

PDF

59.2 KB Created: 2020-07-25 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c39de8adc638f19c752de95fbdd044 SHA-1: 7e0eae4506f2e9fc617ed50a9de9a549eaca842c SHA-256: 67de73e825f5b5ecd327884b68d953de9a0c2527ac79ba6804a1facfb2b48119
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=ordering+fractions+worksheets+5th+grade`. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, with `https://cdn.shopify.com/s/files/1/0436/1479/7981/files/fipamamej.pdf` being one example. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of malicious redirectors and link farms suggests an attempt to lead users to harmful content.

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=ordering+fractions+worksheets+5th+grade
    • http://files.teenagerswithexperience.com/uploads/1/3/2/6/132695741/womog.pdf
    • http://files.aspengrovepreschool.com/uploads/1/3/1/4/131453943/fagodatug-gikuzupi.pdf
    • http://files.ohioballroom.com/uploads/1/3/1/6/131637477/jojobuwupagod_zefimimi_fimegeferud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/fipamamej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/botevudasoniwevuwufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9860/3669/files/bijixixewazapirevubo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/32078738517.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/99345304494.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/fezezexuzinuviv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/27475699009.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/diguropazoxununikev.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/zinaxizelekulajedidujef.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/marubuvimupo.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_off0000967d.bin
6c96ace8ea343a5f48f39372a0cf6cff219542de157cb806b3f7cb2c025dfb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967D 5344 bytes
font_01_sfnt_off0000a8be.bin
1c65ee5a9dbd75a6bdd9ae774fdc1cf1a662eaa3c3bc9bb29fc524db2c56d16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BE 9908 bytes
font_02_sfnt_off0000ca52.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 16116 bytes

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