Malicious PDF — malware analysis report

Static analysis result for SHA-256 987724c0e71e2476…

MALICIOUS

PDF

35.2 KB Created: 2021-07-08 05:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b2465c479fb7b2ff9802fa44c1d8ad1a SHA-1: 7fca92c80816f34ec2719c703f706ab2756b712e SHA-256: 987724c0e71e2476886ae9e26d2120d9ed61c21b21046a5ecd368717e592c9aa
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a redirector URL that is associated with malicious activity. The document body text explicitly mentions 'Daily Coin Master Free Spin Link' and 'game hack', indicating a lure to trick users into clicking the malicious link. The ML classifier also flagged this PDF with high confidence.

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/daily-coin-master-free-spin-link-game-hack In PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-shirt-girl-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/pokemon-go-free-wallhack_GM1094591345.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-sharingan-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-phantom-forces-cheats-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/what-to-do-if-someone-hacks-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/cheats-for-roblox-on-androud_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/robuxian-500m-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/get-free-spins-in-coin-master_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_002_off00003135.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3135 23204 bytes
SHA-256: 497cd6eb343168b037ecdec1cbdfc910878d8bbdf7df010ca95d895648e1b3e7
font_01_sfnt_off0000656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 18768 bytes
SHA-256: 6995f58a3344afdf1c39eea442142c3f86a5b05fd2aa483286546d573d63d37d

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