Malicious PDF — malware analysis report

Static analysis result for SHA-256 9922440fe684e9f6…

MALICIOUS

PDF

45.2 KB Created: 2021-06-04 00:52:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 03b8130e7716f0501ba3ff35d6adee33 SHA-1: 0a1b1ebe85d9bcb18fa63ee8a957a13741b0ef59 SHA-256: 9922440fe684e9f6bcab9d8fa23cc1bdd413116166730ce063ef9625c55d231e
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a 'free Robux hack' or game cheat. The document body and heuristics confirm the lure is for game-related scams, aiming to redirect users to potentially malicious websites. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-robux-hack-no-human-verification-or-survey-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/gain-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-without-verification-2021_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_off00005077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5077 25236 bytes
SHA-256: 5e9a503f4a39aa1ab7129c2613c1fe7c1f9a854080afecca5c707d603cd1fe4b
font_01_sfnt_off00008af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF0 19324 bytes
SHA-256: 661bab6f3a048473b92ec1de100f4f76f72057f0f8e039014173720ccd048479

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