Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05f3d9b2c3308be…

MALICIOUS

PDF

43.3 KB Created: 2021-05-13 12:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9456717a505826fb22495788f5397ce2 SHA-1: 83127de1bc64e49d9501338fee2515c9bccf58f6 SHA-256: b05f3d9b2c3308be72e322bcc06c59edff1dfa777db91c0e17e57248a64f7a8d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically a lure for a 'free generator / game hack'. The document body, though partially corrupted, contains text related to 'Roblox Free Robux' and a call to action, reinforcing the phishing pretext. No scripts were extracted, but the primary malicious activity observed is the redirection to a malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0366

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/roblox-free-robux-no-human-verification-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_off0000379e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x379E 34668 bytes
SHA-256: 3f2c63c0cbfaa5ff33f6a77175bfeeeebeb3bde7937030399e5817c29220adb5
font_01_sfnt_off000086ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AD 18932 bytes
SHA-256: 9d302b82f438100f3cf39adb1b208b926e457e77310e02e89ba7e0c774768e38

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