Malicious PDF — malware analysis report

Static analysis result for SHA-256 becaf3cc23419e73…

MALICIOUS

PDF

34.2 KB Created: 2021-06-20 02:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 125c8c15e91a02c3a0c538ff3ca00144 SHA-1: fc0167c12b4e877792572212e7c69146f7d1f574 SHA-256: becaf3cc23419e73303957341f20cb6a25520430d1d929ad3e57075840e5d158
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action lure related to obtaining free game currency or hacks for popular games like Roblox and Coin Master. One of the primary links, http://netcdn.co/app/431946152/how-to-get-free-robux-2021-easy-no-download-game-hack, is identified as a malicious redirector. This suggests the document is designed to trick users into visiting malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the embedded URLs and the nature of the lures strongly indicate a social engineering attack.

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.co/app/431946152/how-to-get-free-robux-2021-easy-no-download-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/a-hack-for-roblox-tower-defence_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/fly-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/echter-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-songs-mp3_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-can-you-get-free-robux_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
font_00_sfnt_off00002d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D59 21888 bytes
SHA-256: b15515dc2103f6f7b03914412dfaf95120e0531822c490518373ce66b6bc3344
font_01_sfnt_off00005da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA1 19980 bytes
SHA-256: 6e397fa22947be7ed9827a1cfd3252add7dfada8d32d05bfe9f6a04e5027388e

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