Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d14cf7ba828e74…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 23:59:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 870facaa7d0517a0ea42d7fc2f94b4b4 SHA-1: a39f33da6624d5aa1af36473c4fc774d61642b80 SHA-256: 41d14cf7ba828e74fdf64afc3d280644a574ca665b64df4e8d4705cb04a707f3
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one identified as a malicious redirector pointing to 'http://netcdn.tw/app/431946152/free-exploits-for-roblox-game-hack'. This lure is designed to trick users into believing they are accessing game hacks or exploits. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for further exploitation or malware delivery.

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/431946152/free-exploits-for-roblox-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coins-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/pubg-uc-mongolia_GM1330123889.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-roblox-in-prison-life_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/i-need-more-free-spins-on-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
font_00_sfnt_off000031c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C1 22132 bytes
SHA-256: 3fb0b85f006a11787b8dca3db96282384e78448c7b9ee9ef4c130f82615e5c5f
font_01_sfnt_off000062d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 19048 bytes
SHA-256: 8972ce61ac0675ac16da68eab1f4f783fddbc9932eaa3946beb9ca390a13086b

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