Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a72339a31aa2f0…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 16:09:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0931eaf48df49cadd7db438490485eb3 SHA-1: 0a87579d0ab2b447407d030e50d42185b821422b SHA-256: 30a72339a31aa2f091dce759bc40278b3938b26cb0769d4425d85446dc22a12d
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and currency. The heuristic firings indicate that these links are designed to lure users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to exploit user interest in free in-game items to deliver a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-do-you-get-free-robux-game-hack In PDF document text
    • http://instrutech.co.th/images/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/robux-games_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://instrutech.co.th/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/how-do-you-get-robux-on-roblox_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_003_off0000494c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494C 25648 bytes
SHA-256: 89e3f254ae60438ff8ff137725dbcd665926a55398f5147550fbb4dccae890df
font_01_sfnt_off000084a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A2 18612 bytes
SHA-256: 37b0398febc23a1417b5642eaebf6c5e0b941c8fdaeae9a9e3ba89062b3e12f9

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