Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cca146bd95e9c9…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 07:10:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 02b59c605eaf3b296c0084f59cdf0b15 SHA-1: ddd8f56ec5dbc3ed441acc5cb2bf75de012ee455 SHA-256: a3cca146bd95e9c9e0eff67e3dee8ae5cbe0c3a5196e184141abb5b69a4b0102
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free currency, aiming to trick users into clicking a malicious link. The presence of a fake CAPTCHA further supports the social engineering aspect of this attack. The embedded link directs users to known malicious infrastructure, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-roblox-promo-codes-for-robux-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-official-fan-page_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
stream_004_off00005a61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5A61 26620 bytes
SHA-256: 2228e27e218729449358d4021b45e2395a0d3e04892e74555465582d6b3a4f85
font_01_sfnt_off00009840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9840 18676 bytes
SHA-256: dfd02273a8a318689417f97410c8e56666a417a259e3d1ed1911a13d5d5a3d3c

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