Malicious PDF — malware analysis report

Static analysis result for SHA-256 61385ab5722bd33f…

MALICIOUS

PDF

61.1 KB Created: 2020-09-30 02:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2da4a9be8c9e84a7c0a579227b51a34a SHA-1: 52c0eed49a85ac38f5627463eae992822e85235c SHA-256: 61385ab5722bd33f4f0edcf84c420a5b47ba2d2ff44b364baeb70917d6b67b48
192 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link farm. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=bankers+adda+april+current+affairs+pdf+in+hindi In PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/vakufoloxijeg.pdfIn PDF document text
    • https://site-1037106.mozfiles.com/files/1037106/mevopefufojodebojewazor.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/xutewuxezimopozadubikiko.pdfIn PDF document text
    • http://files.deannabaldi.com/uploads/1/3/1/3/131378950/8587648.pdfIn PDF document text
    • http://vonupukab.networkbusinessconsulting.eu/uploads/1/3/0/8/130874179/9612189.pdfIn PDF document text
    • http://files.matsusokankarate.org/uploads/1/3/0/8/130874087/8629928.pdfIn PDF document text
    • http://files.melissatisonart.com/uploads/1/3/1/4/131453817/pedugutotavom_niguru.pdfIn PDF document text
    • http://vorujiru.akergallery.com/uploads/1/3/1/4/131437871/rolunopasajaja_mugozirax_buvivovowewe.pdfIn PDF document text
    • http://files.aetherealmoods.com/uploads/1/3/1/4/131452867/6066553.pdfIn PDF document text
    • http://files.blackriverquarries.com/uploads/1/3/0/7/130739052/e961b2f074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/fiviralono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/cognitive_development_in_early_adulthood.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/whistleblower_complaint_trump.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DE 5356 bytes
SHA-256: ff332c52abdee0b1719cf423aa9168fa10c990a1b47e2178a622f5979c17bdb2
font_01_sfnt_off00008613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8613 15120 bytes
SHA-256: 8af49c204ab0f592fde4cbdae49028a1e5fc57b343328fed684122c104cb9c96
font_02_sfnt_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 7636 bytes
SHA-256: 312c105342dfbe801a8bdf27ddbe9f00acab946ecd612c32bc8514fdf9ca41c1