Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5bd72cc5b0d774…

MALICIOUS

PDF

43.5 KB Created: 2021-05-15 22:22:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 71e019a26024cec77950647f518acd1c SHA-1: f8419bcfe923939d9eece5f7ea347332267fe655 SHA-256: cf5bd72cc5b0d7749f543160a1108ae3cd30b46f4f872834f962b03ff455fb7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free items' lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-hack-people-in-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely intended to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/how-to-hack-people-in-roblox-game-hack In PDF document text
    • https://www.sd-olimp.hr/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/is-roblox-free-on-ps4_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_003_off0000479a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479A 27020 bytes
SHA-256: 14f1d04b1f204e792f30ce1f384c6436c4aa154a98c9e7a2dba3b29ba3074f2b
font_01_sfnt_off00008643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8643 18676 bytes
SHA-256: 10ff19610ec10ba06ce370fdc76468137d93ed174f58c2f80433e0d310d8c060

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