Malicious PDF — malware analysis report

Static analysis result for SHA-256 72730621eae5f4af…

MALICIOUS

PDF

92.5 KB Created: 2020-09-11 05:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ed6f866ed1d4a2242a24024489a79b SHA-1: bde7fd03213193f80ff6d530b5c5143c2c199854 SHA-256: 72730621eae5f4af8adc7aea6672bc4e12a33dbf84d9061a0d1ca0ff5f59c566
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the structure and heuristics strongly suggest the document's purpose is to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=antihypertensive+guidelines+elderly
    • http://files.fsc-nationwide.com/uploads/1/3/1/3/131398507/kodiluruzamoso.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://bavuli.personalpilatesma.com/uploads/1/3/0/7/130739235/d91eb7bf6b.pdf
    • http://files.minterpsych.com/uploads/1/3/2/7/132740692/7884364.pdf
    • http://files.karizmaconcerts.com/uploads/1/3/1/3/131380029/1290954.pdf
    • http://files.vailhalla.com/uploads/1/3/0/9/130969820/9f0cc1.pdf
    • http://pikilufof.hhsclassof1979.com/uploads/1/3/0/8/130814229/lumemabegu.pdf
    • http://files.cedarandsageonmain.com/uploads/1/3/0/9/130969762/5df336c054.pdf
    • http://files.josefulgencio.com/uploads/1/3/1/3/131398369/6591387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/9349/2639/files/blood_cancer_information_in_marathi_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/text-_transform_capitalize_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/adobe_acrobat_pro_9_edit.pdf
    • https://cdn.shopify.com/s/files/1/0438/6874/9979/files/38102516053.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/31370870050.pdf
    • https://static.usrfiles.com/ugd/7baf93_7f4d73cfb1fd47139a3e20d1aa665c05.pdf
    • https://static.usrfiles.com/ugd/599f1c_0b80471f26aa46829196b2d571e7fe82.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_off00010e2e.bin
1962d4774d485725fa82511a619743e80012488a49091d88a9c305fe04699812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 5160 bytes
font_01_sfnt_off00011fcc.bin
39593ebcda1081319f4be6a323a7b39382c4de90ee6970abcfa29247e7a24ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 14992 bytes
font_02_sfnt_off00014f05.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F05 16060 bytes

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