Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f6032abbbaff4a…

MALICIOUS

PDF

51.4 KB Created: 2021-05-11 20:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8cc5221451619b740be195ffa02ac2ff SHA-1: 09eb48d85d6f2e584568d069a5a65dacd9b3b699 SHA-256: e1f6032abbbaff4a31ecfff0580d68202a4cdd1d1126e234542f25a406787e72
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising free game currency or hacks. These links redirect to known malicious infrastructure, specifically a generator site for 'Robux'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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/431946152/how-to-get-free-robux-without-verification-2021-game-hack In PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB1 25748 bytes
SHA-256: a4bb7c708983028cd65abf1c7f18e739a7b312407cdc477d009f124ea3ff1c3a
font_01_sfnt_off000086ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AE 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off0000a319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA319 19528 bytes
SHA-256: 1b346556c7df455cb9a54b8f1a6e3f1a0bfffa2d9228fa0640c35d2bdb9db684

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