Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c26e935eec27d53…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 10:53:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81ae3612382dd38ffb51292af62d7441 SHA-1: d5b004ee8eed58c5be60a7b71897f11a143aa16f SHA-256: 5c26e935eec27d53dc0badb9d58f5ece6fc2a9cb4a0ad974ff072efe8b14281c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising free game hacks and Robux, which is a common lure for malicious content. The heuristic firings confirm that the PDF links to known malicious redirector infrastructure and employs a game hack lure. While no scripts were explicitly extracted, the nature of the links suggests a workflow designed to lead the user to download further malicious payloads or engage in phishing.

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-robux-discord-servers-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-on-amazon-fire-tablet_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-roblox-rose_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.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_off00002ee5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EE5 21992 bytes
SHA-256: 31e759e586223b4287e9637c0f3245ba293050773ce2dd98facdf404fa995360
font_01_sfnt_off00005f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 19292 bytes
SHA-256: b115a2c924602d7af6df8e60d1d5a0905588960aaa46bc3f51eeaab49e44319b

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