Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac84cb4cb9762b6…

MALICIOUS

PDF

37.0 KB Created: 2021-07-06 07:48:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4ee3773acc6de338b1713eb634bc6eb SHA-1: bd5ebb90e83bd18070f92ed4aa1997b92ab34c55 SHA-256: 9ac84cb4cb9762b61592a6f89daeb14daf93e93671c6322f2fd97ef725583734
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to what appears to be a malicious redirector infrastructure, disguised as a 'game hack' generator. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a call-to-action button further supports a phishing or scam attempt. No scripts were extracted, but the primary attack vector is likely the embedded links leading to potentially harmful content.

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/hack-coin-master-2021-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-complete-surveys_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-roblox-to-have-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/can-u-get-hacked-through-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-no-offewrs_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-gamepass-script-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/10-tips-to-get-free-robux_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
font_00_sfnt_off00003a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A21 22936 bytes
SHA-256: 991d73031f6740e62c85f2003fe2cea6d2a55c036b559009104b79683ec3be14
font_01_sfnt_off00006d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 18408 bytes
SHA-256: ac4021def2f54d21e7403250ed57b213ecf57135db0aff9a532298afe491631a

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