Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b7d6722f5b591…

MALICIOUS

PDF

34.9 KB Created: 2021-06-18 00:44:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ab8de79478e63a9ab38f6fb0bbdc34ad SHA-1: 8917c251f1bfbc2afd3677806bff37d398bda71c SHA-256: 774b7d6722f5b591240b26737323f80bb44f36ff54bcd5fcfede5d3013123580
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be directing users to potentially harmful websites.

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.co/app/431946152/italwhts-the-best-free-horror-games-on-roblox-game-hack In PDF document text
    • http://library.acehresearch.org/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-obc-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-codes-august-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/the-northern-frontier-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/cheat-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/military-base-roblox-free-model_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/https-wwwrobloxcom-games-202120217-sponsoredfreerobux2021-about_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_off000030ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30CA 22492 bytes
SHA-256: 340943bf96e1a9bdee20cfab1bff4389be6842bafdc8011a0938011aa9a89145
font_01_sfnt_off000062f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 19156 bytes
SHA-256: 3063da8e9faa6a5140ffdadd855c6ccc00b85d72e1dc3ad5d7bc802bab9398df

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