Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9393b91462d0ca1…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 05:06:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 757ab1e24f0774eafe2ec975791e32a4 SHA-1: 6f66df5bf570b7350a1a2a8f0aed5472581e147e SHA-256: a9393b91462d0ca1b3671df605c4c929492888041c8f81497304371a2dd95bca
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link to a 'free generator / game hack' which is identified as a malicious redirector. The document also displays a fake CAPTCHA or human verification prompt, likely to trick the user into interacting with the malicious link. The presence of a password-protected archive lure suggests an attempt to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/hack-roblox-get-free-tix-robux-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-fix-cheat-engine-66-roblox-shutdown_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-fast-ponits_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/fight-for-glorton-free-l-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-coin-master-spins-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
stream_004_off00005151.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5151 24636 bytes
SHA-256: cb29d649e5272df234869848184386df8147e0f661d4e5b6874cefd3a4396ed9
font_01_sfnt_off000089dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 18712 bytes
SHA-256: 5ab734fe04e36468b633ae2238888bd166c04808c92a34eb58657c3410071f19

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