Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38074d1ffa586f…

MALICIOUS

PDF

41.3 KB Created: 2020-09-18 16:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77644b3e7d459ecf67cd7b8d0185ac9d SHA-1: da5b0641f77e4c1f618d9730f2fd9e5a219d28d2 SHA-256: 7a38074d1ffa586faea26e613b57f6631a62012c5f3ca964496f6e6dfe836d90
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links, many of which point to a known malicious redirector. This indicates a likely attempt to direct users to malicious websites, possibly for phishing or malware distribution. The presence of a link farm suggests an SEO poisoning tactic to attract victims.

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.link/wix?keyword=allegrippis+trail+map+pdf
    • http://kasuju.atlcasestudies.com/uploads/1/3/2/8/132814930/4d98148f1380.pdf
    • http://files.urbansoundstudio.com/uploads/1/3/1/4/131483149/5341926.pdf
    • http://files.leolinbowen.com/uploads/1/3/1/3/131379700/2801987.pdf
    • http://files.diagnosticequipmentstore.com/uploads/1/3/0/7/130739993/rafivijofakad-juruxabida-wusivupetu-wolewubafosav.pdf
    • http://files.innovativecare4u.com/uploads/1/3/1/4/131408280/wigununuju-bupeweriro-milopifafapusad.pdf
    • http://files.amaranthusestate.com/uploads/1/3/0/9/130969370/zofogozugobiru.pdf
    • http://bikezag.sunshinecoastcelebrant.net/uploads/1/3/2/6/132680981/e88b8f7fc10e.pdf
    • http://files.ratusaupdhpe.com/uploads/1/3/1/3/131380688/lutituxiv-demuz-nusakido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6259/9583/files/gafasudolefafum.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/espresso_test_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0422/files/vebuxatag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/97486884058.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/60047038883.pdf
    • https://cdn.shopify.com/s/files/1/0465/9013/2389/files/lindsey_stirling_underground_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/4126871419.pdf
    • https://cdn.shopify.com/s/files/1/0436/5369/3593/files/13625824805.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006428.bin
f18cd19edda05bd2f611b8108eb64512b7e999c534df8b2bd31e90d84f4683c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 5348 bytes
font_01_sfnt_off00007644.bin
828dad981555500d18116e78c4f814b997b051758ac8948d98cc9242b82c8b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 9956 bytes

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