Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16bc93c3b32835e…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 08:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 793f73572b824943c18b8d7bedf16c66 SHA-1: 5849d3828631fd2a60c993ce9451cb75c0701716 SHA-256: a16bc93c3b32835edbd0185296f33f6c1ae223a59885ddfb787fca0e308c3824
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, including one that promises a 'free Roblox level 7 exploit game hack'. The document body and heuristics indicate a lure to download or access potentially harmful content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/free-roblox-level-7-exploit-game-hack In PDF document text
    • http://linens.kiev.ua/images/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-spins_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-hack-into-your-own-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/get-free-robux-right-now_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-nos-urvey_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/hack-sharkbite-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/no-human-verification_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/https-wwwrobloxcom-games-202120217-sponsoredfreerobux2021-about_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-phantom-forces-hacks-fly_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/people-on-roblox-who-give-free-things_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB1 22632 bytes
SHA-256: b5d4e65e99ed49ce37e8e9190404d29bfcb5d1e5e4ab443ccfa51645557b7aac
font_01_sfnt_off00006254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 19220 bytes
SHA-256: 1c060e5c9540c20b824a05786f5576938946079646880deeb4c9bd3d01137c6a

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