Malicious PDF — malware analysis report

Static analysis result for SHA-256 037526446a5eb7f5…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 08:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 017133ebd3d7378654cbccbed4b7494d SHA-1: e9415fe010f57115997936e747cf035e8a3c35c4 SHA-256: 037526446a5eb7f59f391ea85cd2e94f0e28005cd031cab64d3527620dfb4597
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with promises of free Robux or game hacks. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, potentially leading to further exploitation or malware download. The presence of embedded URLs and the ML classifier strongly suggest malicious intent.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/431946152/codes-how-to-get-free-robux-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/is-tiktok-free-on-voxi_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robloxgiveaway-xyz-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-powering-imagination-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-coin-master-site-wwwquoracom_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
font_00_sfnt_off00003374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3374 22964 bytes
SHA-256: 6541c4aed109992f0e5448c9b1f2b526f369769e07159449e1ebce02fa2686f6
font_01_sfnt_off000066de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 19156 bytes
SHA-256: 1abe1f888ea44a86c9f7894949bd06bee09219bb3a2585bcc6d0e8e487c16c49

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