Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb599f753ea97a91…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 20:05:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a489948e32a62f770cdb8f3bcf5d1ba0 SHA-1: e51053ca6232711933b817195cda66f0ee7e4138 SHA-256: bb599f753ea97a918da8bc11b5546e4eca5c1cd4b5148b7fb41a9cd7a417190f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game currency and hacks. The ML classifier also flagged this document as malicious. The presence of a password protection lure suggests an attempt to bypass security controls by encrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.online/app/406889139/free-spins-and-coins-on-coin-master-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-apk-download_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-claimer_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-fun-com-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
stream_004_off00005210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5210 25224 bytes
SHA-256: ea4632c2b32671438300fca276228050a0d0bbf4dc8f1bdb11b7d2576676909e
font_01_sfnt_off00008ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 18060 bytes
SHA-256: 64690fddacb88a1b87eb78a3bf181b542b813998c8d2539429c7660090ba79fa

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