Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5a7a5056576db7…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 00:03:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ab08884cf817b49c6d489b22d61cc280 SHA-1: e705ef4ac6c485f60967300028ddeb1a2721dfae SHA-256: ca5a7a5056576db7a949c880d41464a6acf9c485ec2066824b79ae374f0cf200
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-spins-on-coin-master-link-game-hack. The document body and embedded links suggest a lure for free game items or hacks, which is a common social engineering tactic. The presence of embedded URLs and the malicious redirector strongly indicate an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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.tw/app/406889139/free-spins-on-coin-master-link-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-tiktok-followers-quick_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-hacks-december-2021_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_off000031c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C1 23916 bytes
SHA-256: e6219aa52b05e76cbd5c4abd3455708ba1e2229aa731a8d9194bbf10bf4eb2bf
font_01_sfnt_off00006819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 18344 bytes
SHA-256: e8d74cdfafe168009f9dc4b70b31a19d6777835fd11eed0a51de0eb2e067c79b