Malicious PDF — malware analysis report

Static analysis result for SHA-256 7714a437e06a5df4…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 09:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0eb7c1f740309e20c3767ff5786a9b00 SHA-1: 15502801725df34ef5e6d74c99fa27abc6d29c4f SHA-256: 7714a437e06a5df4e9fbc90d3960558a21bedcfe67da397a77cb896302052b6c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and generators. The document body and heuristics indicate a lure to download further content, likely a second-stage payload. No scripts were extracted, but the embedded URLs and redirector activity strongly suggest a malicious intent to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/free-games-like-coin-master-game-hack In PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/mathep_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-mod_GM406889139.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_off0000485a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485A 25936 bytes
SHA-256: ef94252526fddcc233c2bf5a536fbfb85e6bfc996f5a1daa505b55262b379a24
font_01_sfnt_off00008276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8276 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 18140 bytes
SHA-256: 0fa8c8b4839815decb7824e6abfd23c338a1fcad8391028ddb14be23d50d94bc

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