Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f7f303a06beeeb…

MALICIOUS

PDF

41.2 KB Created: 2021-04-30 12:07:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9af8e0030f49465fd051a9b539088991 SHA-1: 618b97046aba1294d4f6f48590a95dcdf1d43f37 SHA-256: 31f7f303a06beeebadfaf50b84afa4b758b0a79f1967187a490d6c5f11488b13
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains multiple links to external websites, masquerading as 'free generators' or 'game hacks' for Roblox, and impersonates Amazon. One critical heuristic indicates these links point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to these lures and the primary malicious URL. The embedded links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-btools-hack-mega-game-hack.
  • 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 https://netcdn.xyz/app/431946152/roblox-btools-hack-mega-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-codes-not-used.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-pink-hair-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-how-to-look-cool-for-free-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robloxcom-free-robux-obby.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-animations-in-roblox-for-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/apocalypse-rising-roblox-hack-25-02-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-jailbreak-cheat-noclip.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-website-hacks.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-you-get-free-robux.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-free-bots.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_003_off0000407f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x407F 26480 bytes
SHA-256: cb86d960216e86f406693f382a026b74016506e8042178c1ef67f8704a6ddd98
font_01_sfnt_off00007dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 18768 bytes
SHA-256: 672ddf961fe04dfbf50cb0245cfce84dcb530063ff622bc27947fec4531dc844

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