Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c00efcca7dbd08d…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 03:59:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1fb9c02fae7f11066dcee8d3f8f9b3f7 SHA-1: 00175344284d6963599073e69f92a1808e09eebd SHA-256: 5c00efcca7dbd08d81595b4dc47cc9bf8dd12c430df5e9ffb79e1e14c19ba097
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically advertising a "game hack" generator. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the lure of free game hacks indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/se-puede-hackear-coin-master-game-hack In PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-group_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_off000049e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E0 25012 bytes
SHA-256: 6c5faa82ab2e10522b98a787f8d089f4c063213e623e44df7fe3b49108b47060
font_01_sfnt_off0000821d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821D 18184 bytes
SHA-256: 52a96ef7ba39a26893895b90e9b4f2c5af116e165a9a1008a5be9b99a8a362cf

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