Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4f4885f67e46db…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 15:33:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 423f3c3e9bc1fe164d2f02ba0e277eb3 SHA-1: 2b4a87e4e5a915f9aa0b6652481f423b818bee3b SHA-256: 7f4f4885f67e46dbe5b60dae81de4f4ffdde6f5fec98aaafc2e6119f309f300d
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to external URLs, including a primary redirector at http://netcdn.co/app/431946152/hack-roblox-accounts-download-file-game-hack. These links are presented as download opportunities for game hacks and in-game currency, indicating a social engineering lure. The presence of a malicious redirector and the ML classifier's high confidence score support the assessment 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/hack-roblox-accounts-download-file-game-hack In PDF document text
    • https://hekl-software.de/images/unjailbreak-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/how-to-hack-some-ones-roblox-account_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-free-avatar-makers_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-demonius-free_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/by-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-100-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/how-to-get-free-robux-no-hack-no-download_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-get-eaten-hack_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-robux-site_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/knife-server-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/how-to-get-free-robux-no-verification_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_off00002ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC3 22472 bytes
SHA-256: 1d4d7abc8f8eb8f694130628002c1645e153e5a331afcacb2ed859b7134de860
font_01_sfnt_off000060da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 19688 bytes
SHA-256: b6eb2f21dc3b5e3e8bad5942b66b2dba11cfedafdb25ab4d1fadc359403e3630

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