Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6783e4eafc3d66…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 06:52:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6bcb2787aab8e6f41b066cba1509e0df SHA-1: 78c062f4f2d4c76a2aae33187c10fb181ce0f676 SHA-256: 9d6783e4eafc3d668849263b417f5965155258d71b78a6b98c4f4525792f09ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links, including a primary malicious redirector at http://netcdn.tw/app/406889139/coin-master-free-spins-usa-2021-game-hack, which is designed to lead users to potentially harmful content. The document's structure and embedded URLs suggest an attempt to trick users into visiting malicious websites, likely for further exploitation or credential harvesting.

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-usa-2021-game-hack In PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-accoiunt_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-accessories-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-ames_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/deadzone-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/pokemon-go-free-promo-code_GM1094591345.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-inventory-free_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-party-favor-tags_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/paginas-roblox-free-robuxx_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/oprewards-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/funny-free-roblox-t-shirtd_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/if-you-have-builders-club-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-free-girl-clothes_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-free-body-bundle_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_off000032ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EF 22696 bytes
SHA-256: a4290bf357a7ea34315411c49138f349d408ff76bcb5575826a557cb4003e3c7
font_01_sfnt_off000065c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C8 18764 bytes
SHA-256: 0888549f12c4c2b3480353857dbb9d3bf1f59ca6f0980f33e251b640016871eb

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