Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5d2351def6639f…

MALICIOUS

PDF

42.5 KB Created: 2020-09-16 20:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a0576b56886ada15aed3dcd6591c93c SHA-1: fe4664760bc0a26543d969f1b0de0b861bd5e9ae SHA-256: 7b5d2351def6639f5d80984efdb481462129e6dda1b72c3afe781c6225d58c54
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though corrupted, contains text suggesting it is a 'solutions manual', a common lure for phishing or malware distribution. The presence of many external PDF links further indicates a link farm designed to host malicious content or redirect users.

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.me/wix?keyword=financial+accounting+libby+solutions+manual+pdf
    • http://sited.tnquarterhorsesales.com.au/uploads/1/3/1/1/131164112/wepabavebot.pdf
    • http://files.cantornote.com/uploads/1/3/1/4/131453592/suzisetokiviredaw.pdf
    • http://kiwixep.mesmanfarm.com/uploads/1/3/1/4/131438448/6036353.pdf
    • http://files.zimmermansailing.com/uploads/1/3/0/7/130776401/nugadusijokesimuz.pdf
    • http://keganawi.villageofhopeministries.org/uploads/1/3/1/3/131379956/4785698.pdf
    • https://digitalcontentmarket.org/wp-content/uploads/2017/11/Solutions-Manual-Fundamenta
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/36843652458.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/77045765501.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/book_dedication_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5058/files/945737312.pdf
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/monthly_timeline_powerpoint_template.pdf
    • https://09ff10dd-af4c-472f-bd7f-f1edddd52c6d.filesusr.com/ugd/3ed902_bb17fcff288642e79e2b91b28a5eca0e.pdf?index=true
    • https://6f775e63-0572-4a21-9a42-1013e3d440fc.filesusr.com/ugd/3835dd_5689e07dca3347d1b179bca56342b994.pdf?index=true
    • https://e47dbc4e-c64d-48bf-bd2a-fd9a02c34f9a.filesusr.com/ugd/8a05ec_0fadc5415df146d7bbf0ceb75d6f4d1d.pdf?index=true
    • https://52d2b9e5-13ec-4a6b-8f3c-85192703f808.filesusr.com/ugd/f35da0_29bbc89e843247c2bf9da855b25e4f44.pdf?index=true
    • https://74bd50bf-46d7-4e3e-9b94-948df8982ef1.filesusr.com/ugd/fedf23_319aacfb225f405f9db4bd47805405e2.pdf?index=true
    • 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_off0000666c.bin
8ee668ce4b9678dc16d5e0b0a276fa6f46b6ced98a54ba41090fca302dc1c527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 5576 bytes
font_01_sfnt_off0000795a.bin
586716b79e4e861590768c827e76c78dca14179a7527da4e801d6e35bd7ade80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795A 10540 bytes

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