Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0d9f371e7d04c5…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 11:20:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ff762fdf3a446a4b1bec226fafe82dce SHA-1: 312ecccf7a824fca21d5ec3413b9ea54ce80eaae SHA-256: dc0d9f371e7d04c5fd421543ae45cdfc7c741410433c621a7e7149042ce15612
208 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure and promises of game hacks to trick users into clicking malicious links. These links redirect to known malicious infrastructure, likely serving as a gateway to further malicious content or exploits. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/site-17-roblox-hack-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-robux-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-robux-en-francais_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-microsoft_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_off0000516d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516D 25744 bytes
SHA-256: 0ae85ef6520024504212042fb9024ba5290a8d4bca6d233321dce47cd06e1dbd
font_01_sfnt_off00008dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC0 18568 bytes
SHA-256: 557d01abfe791837afd6bcbb5223b0e4d551627a8a6003c7540389424ab7ca95

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