Malicious PDF — malware analysis report

Static analysis result for SHA-256 4921ba9e0a97d6e4…

MALICIOUS

PDF

41.8 KB Created: 2020-11-03 07:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d49cd37f88d5d8eead51cbd5e0b6f4 SHA-1: ca56a1bda66cd0a187388d2d7373b85e3c42a6ae SHA-256: 4921ba9e0a97d6e49255cc1f05d5261423a91d063030931e43242b0ec48a8a32
102 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, disguised as a 'free fire apk downloader'. The ML classifier strongly indicates maliciousness. The presence of a visual download button and the embedded URL further support a phishing or malware distribution attempt.

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.
  • 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/aws?keyword=free+fire+apk+downloader
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/falevi/suxefatuximeniwufijozituk.pdf
    • https://s3.amazonaws.com/levovod/35468864340.pdf
    • https://s3.amazonaws.com/pisedij/44494797763.pdf
    • https://s3.amazonaws.com/bejideba/como_fazer_assinatura_digital.pdf
    • https://s3.amazonaws.com/zamuriza/first_aid_kit_my_silver_lining_meaning.pdf
    • https://s3.amazonaws.com/vifusupegiza/melrose_public_schools_summer_reading.pdf
    • https://s3.amazonaws.com/nokiva/56445749804.pdf
    • https://s3.amazonaws.com/susopuzupure/9434647072.pdf
    • https://s3.amazonaws.com/nagev/98004615297.pdf
    • https://uploads.strikinglycdn.com/files/7c9dde31-70e3-492f-bb3a-7f7b47c534ff/xelinazukipowazudosana.pdf
    • https://s3.amazonaws.com/robumuduluwise/62105349631.pdf
    • https://uploads.strikinglycdn.com/files/49f15c2b-66a4-4ed7-8104-fd2b9df6a305/75627759233.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bc.bin
d37ed3086cc50058a045d5bb5fb573e9a83e0bd7e0530bee58ce8f03c36d7de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 4968 bytes
font_01_sfnt_off000075d0.bin
451816e6f1f4205083be02cae1c1e69a99224aeaa52238eeeecbf4bdd7bf5084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D0 10936 bytes

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