Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bee4c4400bf57e…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 05:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 33fc40d5528a7ca0334853aaaaf51588 SHA-1: 9760085753d3201244bb6d4547a38dbfe4fda5ea SHA-256: d3bee4c4400bf57eaadd34c6349dab0e2c26b5780cb9396d95163ef682a3f404
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of game hacks and free in-game currency. The primary redirector URL is http://netcdn.tw/app/479516143/minecraft-112-hacked-client-game-hack, which is flagged as malicious. The document's structure and content suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/479516143/minecraft-112-hacked-client-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/how-do-you-get-the-ability-to-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-u-get-free-robux-without-builders-club_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-jailbreak-hack-client-download-trackid-sp006-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-2021_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_off0000315e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315E 23164 bytes
SHA-256: dc25f2a455802014dbdc58d884c109bf2c2cde5d5006dca5aa4bcedab84f273b
font_01_sfnt_off000064f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 18504 bytes
SHA-256: 1c6239c4e7240bb93b61e959f2b21d4e00e02324577494d7f11381c67a244304

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