Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8c7044603e990b…

MALICIOUS

PDF

46.9 KB Created: 2021-06-10 23:57:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d527446d87005458c9efa4e4c9973dba SHA-1: d0e9580b461f6496e9d5c1f4634e8798e22bc1d0 SHA-256: 5a8c7044603e990bec349f22c0160700ad796a20fcf425768c4b6b93d3b37675
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The document body and embedded URLs suggest a lure to trick users into visiting these sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-get-free-money-on-roblox-bloxburg-roblox-game-hack In PDF document text
    • http://alcomet.ru/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/redeem-gift-card-roblox-free_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-hack-base-wars-roblox-2021_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/roblox-free-download-meepcity_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/im-using-a-hacked-clinet-music-id-roblox_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/roblox-script-hack-pastebin_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_004_off0000509f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 29620 bytes
SHA-256: 71a0ae128e8d3137702880642ec7276a7f5f1f0af6b06399abfd39151ef705fc
font_01_sfnt_off00009288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9288 19020 bytes
SHA-256: 2174b8ebc61d5c8ff7b35f517a16450dc859c58915d9d68b3745b3e60f0940ae