Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcb956c1cd67691…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 06:08:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca49944e611c7abfe8ea45e6e89b2e94 SHA-1: ac99893cc3d3008ac1979b2f857fea67a1410b5d SHA-256: cdcb956c1cd6769107033985e4c9cc57fb75e41320b6c1a28a33224c2ea5c731
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate the document is designed as a lure to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded URLs and the document's content suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-hack-ios-reddit-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-cheat-engine-download-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/cheat-codes-for-roblox-candy-war-tycoon_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-free-t-shirt-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-girl-shirts-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/pubg-uc-dealer_GM1330123889.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-no-human-verification-or-survey-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_002_off00003708.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3708 23200 bytes
SHA-256: 57bbe83fcf8a48125dd8a632bf2cf072f397ce9bf2c1ad25821da462c5ffdf7c
font_01_sfnt_off00006ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 18180 bytes
SHA-256: 36a5529bcec1a9ebfeb67e8a1c9eb6b6afb40cca80507846db0d415d086f7376

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