Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf34d1cdc19b4cb…

MALICIOUS

PDF

41.9 KB Created: 2021-05-11 01:05:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d1833330dd11bc5336419d6cc6b0d426 SHA-1: 17d68f8520dd299de045f8587b65aa3a4b912a74 SHA-256: cbf34d1cdc19b4cb1edb9a167a287c43ef5a94a7b7cc373e20eaa181625d1b69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically designed to lure users with promises of game hacks and free in-game currency. The document body, though heavily obfuscated, contains references to 'Free Mod Apk Coin Master' and the malicious URL, reinforcing the phishing lure. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-mod-apk-coin-master-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/get-free-robux-without-doing-anything_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_003_off00004aec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEC 23968 bytes
SHA-256: e6c51a84a9bb139620a8fd980417ce12e0e623868a3952338926a07b3b9d0e3c
font_01_sfnt_off0000818e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 18228 bytes
SHA-256: 94a160b3eebda81a774dce60345efae5de7f6df629fda5b11a26048b94d99866

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