Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cbb111e2b91ea8…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 21:34:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e5659f35e1f54c86df8edc3f014e5fb SHA-1: 1b086720d654228f994690258ba4bef659c428d3 SHA-256: 57cbb111e2b91ea8ed47e7c5825b608823d2c166c0a1ab1b92bc4788dab47c16
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a URL that likely hosts a malicious payload. The document body and embedded URLs reinforce this lure, aiming to trick users into downloading unwanted software. The ML classifier also strongly indicated maliciousness.

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/coin-master-hack-mod-apk-unlimited-spins-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-admin-on-roblox-mad-murderer-2_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-booga-booga-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/best-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-jailbreak-how-to-get-free-radio-deutsch_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-speed-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-svg-free_GM479516143.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
font_00_sfnt_off00002ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFE 22496 bytes
SHA-256: 1d789a1a4edea0953645a11c4080a143ea62e9d63d0d4e87fd1b8539c8c15aa8
font_01_sfnt_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 18876 bytes
SHA-256: c71a24b620bad33a336f203fe19cb26eb375f7b6667ba01091b66d2d0e3ba746

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