Malicious PDF — malware analysis report

Static analysis result for SHA-256 f120b6b45843996f…

MALICIOUS

PDF

39.3 KB Created: 2021-05-17 08:02:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93fd8f0ed68db2d2f09ce0850a727d28 SHA-1: 104cbf0543878fa3ac204cd245835f7504369acc SHA-256: f120b6b45843996f0e45071f638c2e36eaa5d5efd4a61ed1ba4fc56d1d0c310f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free Robux generator' which links to a known malicious redirector. This indicates a phishing attempt to trick users into downloading potentially malicious content. The document body and heuristics confirm the use of a redirector to a fake generator site, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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
  • 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://netcdn.xyz/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003395.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3395 28496 bytes
SHA-256: cf6080d38e980e54bb2a645a7d4aba8c7c449c7e6c98f57f0fc37c068de5b5fd
font_01_sfnt_off00007492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7492 19556 bytes
SHA-256: 08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8

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