Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d23d541be96770…

MALICIOUS

PDF

34.8 KB Created: 2021-06-30 03:49:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f5e4315f200b1145f72de348a02fd66 SHA-1: a687b8250e242823502a7839ff1e0b080f4f359c SHA-256: b5d23d541be9677097cb261a579e6485bd3ca723c3a75338f14d4655e2a097ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and potentially unwanted content, such as game hacks and generators. The primary link, http://netcdn.co/app/431946152/hacks-for-rocitizens-on-roblox-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a lure for users seeking game cheats or currency, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/hacks-for-rocitizens-on-roblox-game-hack In PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verifying_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-no-downloads-2021-real_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-account-hacker-free_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-roblox-accounts-2021-october_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-cheat-codes-builders-club_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/khaos-robux-hack_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/como-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-script-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/secret-roblox-hacks_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_off00002f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F69 22904 bytes
SHA-256: d6c64942141bb894a73317e7098eba00b5a16eee6b0b0b9069d80819dd56dc6c
font_01_sfnt_off000062dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DC 19128 bytes
SHA-256: 612a72a8e22fd451ec2092fdae14c8072314bc2ec03874b0997b9f29edeb6c23

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