Malicious PDF — malware analysis report

Static analysis result for SHA-256 c936d027147d9a62…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 20:27:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d33a9046bbcc0af231b43e3685a0ead SHA-1: 4d61e2e549505901762a656a2efb8063300ecc99 SHA-256: c936d027147d9a62695e311c6d2887ec71dfce667d1e84f17419a0184b40a7ab
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free spins' lures. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-link-may-2021-game-hack, is flagged as malicious. This suggests the document is designed to trick users into visiting these sites, likely leading to further malicious downloads or exploits.

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/coin-master-free-spins-link-may-2021-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/comment-hacker-dans-roblox-pc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/fps-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cheat-in-roblox-rocitizens-money_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/800-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/aincrad-online-free-beta-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-forum-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-kill-anyone-in-roblox-hacks-v3rmillion_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hacks-2021-unblocked-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacking-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-scrit-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
stream_002_off00003005.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3005 22508 bytes
SHA-256: 14ff637dc3dbfb7ea240f5f8de7d102a76546ebb01850c5fed7de4f15650a0c9
font_01_sfnt_off00006207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6207 18924 bytes
SHA-256: ef212b5cda993b4ecad8fae2f854e205e09bfeaf0789e767c9f8e92b7f4704a7

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