Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b27f15f041bac5…

MALICIOUS

PDF

38.5 KB Created: 2021-05-23 09:10:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 23fcb62e22eee22d661fd1afa3e00703 SHA-1: 6e76a97f16436e0711c5e90f8357db5350bfd90c SHA-256: 23b27f15f041bac5d603f6a954447a765b19d007e2914e85741fc9b6ad6af0e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and potentially malicious content, disguised as 'game hacks' or 'generators'. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a lure designed to entice users to click on these links, which likely serve as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/how-to-hack-someone-on-roblox-game-hack In PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn 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_002_off000034a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A5 27884 bytes
SHA-256: ea56908fb3d598e10c20b692809f578bb72448c407f9cf4711bbc37ea8211447
font_01_sfnt_off00007432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7432 18608 bytes
SHA-256: eebf4fd0ce8e014a693b7448b6f63c7fd528199174cddc1a90a23252bff1a633

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