Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf9b20d5d933033…

MALICIOUS

PDF

66.3 KB Created: 2020-09-17 17:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384b2fcf7071b389142ccb4cf39a0864 SHA-1: ab6949888ff9a687eb967eb5cfac20937b916742 SHA-256: aaf9b20d5d9330335f28d9b459b94369a92b855625f3831b409cac0759442643
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '4 pics 1 song answers level 6' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.club/wix?keyword=4+pics+1+song+answers+level+6
    • http://fisibodix.faithinthevillage.org/uploads/1/3/0/7/130739625/pawukup.pdf
    • http://files.bobbijasayphotography.com/uploads/1/3/1/8/131856270/4caf862af9ca1.pdf
    • http://sukax.brianjamesfoley.com/uploads/1/3/2/6/132680813/4796168.pdf
    • http://sesez.justintimeteaching.com/uploads/1/3/2/8/132815002/pusarizeli_segujojarozeji_demuwaporilase.pdf
    • https://3645e812-8872-42ee-90ef-ace179f00259.filesusr.com/ugd/ac8c68_531937f825754cab85397fceb6eb8fde.pdf?index=true
    • https://611020d0-462c-409b-8077-bf5902a7e7e0.filesusr.com/ugd/b9801a_08d49573303f4533b2321fad5a30599c.pdf?index=true
    • https://28aa7ad9-851f-4e93-8070-5e22b3619d60.filesusr.com/ugd/724fb5_b9a057daebd743b38bf29073a9a6aefe.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/67875436134.pdf
    • https://cdn.shopify.com/s/files/1/0437/7827/7527/files/developing_the_leaders_around_you.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c741.bin
7d853acd6c7f47f36da04c2d64ca5ccc9e5c67501097065a6988c81aa0f9a4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 5452 bytes
font_01_sfnt_off0000da00.bin
24c6928196cd9101233c1f75ab37c3b18be78b5b6b6bc0902645ed641bf0bccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 10288 bytes

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