Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f830c192c648e80…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 23:48:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 595e0cf7f9f046f269ef16171d61fa25 SHA-1: e89f096880c1b7765dc31335b96f41e0012392e9 SHA-256: 6f830c192c648e80015e6f204d599c6c7c1d5931990b44840da9764156d26525
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising game hacks and free currency. The document body and heuristics indicate a lure for free in-game items, likely to trick users into downloading malware or visiting further malicious sites. No scripts were extracted, but the presence of malicious links and the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-coins-coin-master-2021-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-brick-master-cheat-video_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-hearts-2021_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-obby-gives-you-free-robux-july-no-password-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/8bp-hack-coin-master_GM406889139.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_002_off00002de4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DE4 22648 bytes
SHA-256: fbcf761dc400f57e85a9920a23a805185f13566fb8199c05e483a324c3cbaa81
font_01_sfnt_off00006097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6097 18400 bytes
SHA-256: 2a3e6040a3b782e95a9624477cdba266f2d22bc61ba2df799c05fa910d77e25c

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