Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c920cffd37c295…

MALICIOUS

PDF

44.3 KB Created: 2020-08-24 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3854cb3606f346b318ab8990895617 SHA-1: af80ed69b9a051df84e288191fe5e565bc947d3a SHA-256: 24c920cffd37c295481a2eda046f758b67f6c1a555def84f92f14dcbab6184c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'Bollywood movie free movies counter' and the malicious URL, suggesting a lure for potentially pirated content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector attack.

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.com/pify?keyword=bollywood+movie+free++movies+counter
    • http://files.wiltshiregardeningcourses.co.uk/uploads/1/3/1/8/131856170/jonexiwojuj.pdf
    • http://pedimene.kingslynnchristadelphians.org.uk/uploads/1/3/1/3/131384635/2791153.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/jolizukipew.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/apa_writing_style_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67295211500.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/the_adventures_of_tom_sawyer_oxford_bookworms.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/34665549875.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/kozesebetabunava.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/digibelomodesali.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/99108549130.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/39384820389.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/ligapavumuwol.pdf
    • https://cdn.shopify.com/s/files/1/0463/1196/4829/files/human_heart_worksheet.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e8.bin
e44e4f361646228bb5085e3671bddf64e5ac222e9c06963acda30225701fba3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 5260 bytes
font_01_sfnt_off000075da.bin
f087e5b8ca895520b670dd5645b56c71eb510b7a52d3a256546ee108696a8f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DA 10112 bytes
font_02_sfnt_off000098a0.bin
dae77d1fc2f0bb6d37dfe4d5f1a20459619bdeef61ac9786953f5e0219e4fcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A0 2736 bytes

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