Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0c5040ffa5a2f…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 06:10:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5944f959d0ecf6c114e239a33d6987ab SHA-1: 9b975a697bdfd9be95d5ae3ef2240bdbd7915b9b SHA-256: ccf0c5040ffa5a2f03c716408421477232a8b6436458740519ce9306e6fc8625
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, specifically promoting game hack generators. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely to initiate a download or navigate to a malicious site. The document body and embedded URLs strongly suggest a lure for free in-game currency or hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/406889139/coin-master-hack-spins-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/pokemon-go-hack-free-coins_GM1094591345.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-2021_GM431946152.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_004_off00004ea2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA2 25276 bytes
SHA-256: 53288fc41f084ecff2c6d0104b4f360c10cdd286b191d3ba9afe2d5c962db705
font_01_sfnt_off000087c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C8 17892 bytes
SHA-256: 340cad640208a3f63c565dece8f0e8a86db030e36dd2ab9bf46956c7901539b7

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