Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd714d350844359…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 15:05:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ae84da637f2bafbe8bafc7c9f80dfbda SHA-1: c90773a405fdfb1238d3752958fbe1a718e8abdd SHA-256: 9dd714d3508443595334b7e08fddf37ca835e71f163b8bc79c22502922124595
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, that are disguised as 'game hacks' or 'free generators'. The document body and heuristics suggest a lure to download a payload, potentially an archive requiring a password, which is a common tactic for bypassing security filters. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/health-hacks-roblox-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/urbx-club-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/shop-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/beast-mode-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-hack-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_004_off0000521c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521C 25784 bytes
SHA-256: 3f82f4a039ecdeabce16e09c15343f62ed1a410e6f55d3f6b85fba2e5f3f806f
font_01_sfnt_off00008c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C3B 18452 bytes
SHA-256: 2ccf4cc5051f92cdba8c5dbef62bbe7e87210bc0ab3e2286eeefec124fedce74

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