Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ef91abc6eedd29…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 23:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b4ad33786fe42ccee0f148f5ae73bca1 SHA-1: c9fdb5e4c7fab0ba6436f7906875cca674e627db SHA-256: 50ef91abc6eedd290ebd1d6e2a6de7b56361642df8a054759ad24e70a85e9f9b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of free in-game currency and hacks, directing them to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Free Coins Spins On Coin Master' and the malicious URL, reinforcing the lure. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-coins-spins-on-coin-master-game-hack In PDF document text
    • http://digilib.ivet.ac.id//repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/robux-best_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://digilib.ivet.ac.id//repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.ivet.ac.id/repository/roblox-free-clothes-hack_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_003_off0000472a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x472A 25048 bytes
SHA-256: 01b4c9fc7dddc9c0f3b42b85bed8a5ecd774956f7724ce1ad55916da1db41ff4
font_01_sfnt_off00008063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8063 17884 bytes
SHA-256: 2709d7507dedf16751127bf82807670e81eddbd263ed2ed49234c29c67e5f45e

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