Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c31a9deac6e865…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 05:06:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 77b4e58200a8f73f37d8178ee4d42bc8 SHA-1: 8fd38095218aa353ec9fd9fb774c33b6afeae32d SHA-256: 79c31a9deac6e8656a1462a51825cd5a17c0ebd90c66435592d38cff89d378c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a lure for game hacks and free currency, directing users to a known malicious redirector URL. The document body and embedded URLs indicate a phishing attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the primary function appears to be redirecting users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/haktuts-coin-master-free-spin-link-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/run-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-bc-for-free-october-2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/admin-commands-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spin-hack-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_002_off000030ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30ED 23472 bytes
SHA-256: a6ff42f3e676c2a4a5b556955cfb720c1aeced6297ffd3cce2be468a983eb0eb
font_01_sfnt_off000065ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FF 18484 bytes
SHA-256: d9a037a653ed28116979e3af0bb76bb4d7eaba1060cd405c4d4ff8bdf95a3337

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