Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b7d866eaca132e…

MALICIOUS

PDF

34.2 KB Created: 2021-06-28 05:35:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 20587baf7b296e26e13fd6f905058b71 SHA-1: 6d66fcdb33583a297a74a08178173259fe8afaec SHA-256: d3b7d866eaca132e9070cb32c9394e94e0e64a55bffef6be554649069fec9a82
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-codes-2021-not-used-game-hack. This lure is a common tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or malware delivery. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt.

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/free-robux-codes-2021-not-used-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/0-0-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-in-roblox-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-ios-hack-no-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-go-through-walls-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-generator-no-human-verification-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
font_00_sfnt_off00003009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3009 21592 bytes
SHA-256: e74e5197100c837a27af3ecc71c3b2e8f80ff1a88fa29976c263e17e5a29b6ed
font_01_sfnt_off00005f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F23 19396 bytes
SHA-256: 25d7bfe460846437b60ba32f00233ff0583bbe4639522c561b722c1edc24abf6

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