Malicious PDF — malware analysis report

Static analysis result for SHA-256 72895804bfe5fd6c…

MALICIOUS

PDF

45.9 KB Created: 2021-05-15 23:03:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f93a1723b5ee92034385b6aabaee114f SHA-1: 5553214e3c0d33f43999456a83b043c6d4cee906 SHA-256: 72895804bfe5fd6c60af2f88ad1a0ff0e600ac863eecb0110a2bf86a521641d8
200 Risk Score

Malware Insights

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

The PDF document employs a lure of game hacks and free generators, presenting a fake CAPTCHA to trick users into interacting with malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to a second-stage payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/how-to-win-attack-madness-in-coin-master-hack-game-hack In PDF document text
    • https://www.gymun.cz/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/robux-miner_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9F 25116 bytes
SHA-256: e3d8ba85af35def8b0de1e9fce1b11bc3b288a35ed5f3fbbc87aa86f8839e36b
font_01_sfnt_off00008379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8379 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00009101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9101 18252 bytes
SHA-256: ebc75091247f42f4d8f6f5328204ee4b219dff7698097371fec03a0e52319ffd

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