Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3bc1c117508731…

MALICIOUS

PDF

33.3 KB Created: 2021-07-20 04:44:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 376b0d66aca72e56137e74093ba34a6a SHA-1: d6556f6bab0c5c050bfae612fc81ab9c383ce150 SHA-256: 9c3bc1c117508731a453196099d8719453539ab992d21721485c68c67ee79064
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-without-doing-anything-game-hack. This lure, combined with the ML classifier's high confidence score, indicates a phishing or malware distribution attempt. The document body and embedded links suggest a scam related to free in-game currency or items, a common lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://netcdn.tw/app/431946152/free-robux-without-doing-anything-game-hack In PDF document text
    • https://gabrieliassociati.com/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://gabrieliassociati.com/images/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://gabrieliassociati.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://gabrieliassociati.com/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://gabrieliassociati.com/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://gabrieliassociati.com/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://gabrieliassociati.com/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://gabrieliassociati.com/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://gabrieliassociati.com/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://gabrieliassociati.com/images/coin-master-hack-activegamer_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
font_00_sfnt_off00002971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2971 22784 bytes
SHA-256: 11cb714bbf235553cd8b1ceab2701d52e911338289f34b92bd1d9d966b008af3
font_01_sfnt_off00005c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C91 19424 bytes
SHA-256: ce4897eff9d04202a557cf473123b6bbe5415239b22eda76d44945625b44829b