Malicious PDF — malware analysis report

Static analysis result for SHA-256 19542dfb62cfcf16…

MALICIOUS

PDF

46.9 KB Created: 2021-05-13 19:47:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d68951f69ecb7bb25cd97d50763853e SHA-1: 582aac44525a433096da896416a2a10410fafbbc SHA-256: 19542dfb62cfcf160b67d716996207aa1fc3088809889c34f415235e15c37077
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a "free generator / game hack" lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious website, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://netcdn.xyz/app/431946152/op-rewards-robux-game-hack In PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/roblox-person_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-spins-link-blogspot_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_003_off00004b3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3D 33648 bytes
SHA-256: 2071cf5d1b1f9fb3353d099af4f8e6d47a63b6483a7270695d64380282148b18
font_01_sfnt_off00009441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9441 18592 bytes
SHA-256: 61fcf6890a53ac437d28a0a1b955c1ae9fc36ec45f89f4a8c20bebee047e4314

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