Malicious PDF — malware analysis report

Static analysis result for SHA-256 265ce8e981981b2b…

MALICIOUS

PDF

34.9 KB Created: 2021-06-18 23:37:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d3564d44880dce60b12ca47dca91cc4c SHA-1: 4fb95f241e0144583933cb5bce70fb1d743b92c1 SHA-256: 265ce8e981981b2bc078daf1e81d2cea61e2f5107ee3f81c5e33d519aefe9135
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a malicious domain, likely as part of a phishing or scam campaign. The document body and heuristic firings indicate a lure for free game-related currency or items, which is a common tactic for distributing malware or leading users to fraudulent sites. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly suggest a malicious intent.

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/a-free-robux-gift-card-number-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/free-run-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-without-sign-in-also-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/blox-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-easy-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-hair-roblox-code_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheat-roblox-ninja-legend_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pokemon-go-free-coins-promo-code_GM1094591345.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-tiktok-likes-for-free_GM835599320.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_off000031f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F6 21964 bytes
SHA-256: 1a547a945d5014f85f62ccb45438afecc141b969c79880dfd5de193bb4308bc9
font_01_sfnt_off0000626e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626E 19376 bytes
SHA-256: 9daef92b00d9b98bc6b106472ab78b2b9a66eef27cd9112fba056fbf59c84f73

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