Malicious PDF — malware analysis report

Static analysis result for SHA-256 a657e98cc7a368f2…

MALICIOUS

PDF

33.0 KB Created: 2021-07-10 02:58:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22c20c1c3e8266b3de8c5d05c82ac2c5 SHA-1: 6aafa6a71249a1d380564c6b06be9c9f35e6e671 SHA-256: a657e98cc7a368f20216c3455ed162cf94698d62b79fad0a18f2d1e9930a37d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, which is likely intended to lure users into downloading further malware or visiting phishing sites. The document body and extracted URLs suggest a scam related to game hacks and in-game currency. The presence of embedded URLs and the ML classifier strongly indicate 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.tw/app/479516143/mcpe-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-download-roblox-on-ps4-for-free_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/5-get-unlimited-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-hack-inspect_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/amimbot-hack-for-strucid-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/dantdm-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-para-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/illegal-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/i-got-hack-by-melvin-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-to-get-free-spins_GM406889139.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_off00003042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3042 21632 bytes
SHA-256: 9c127b7f3ad26db71492dbeba95235b3714e30890060195ee6c811429c875c27
font_01_sfnt_off00005fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 17808 bytes
SHA-256: bb08dbf34a52122f895504de6d0f043fb34325a43da687a59d3db3469e279ba9

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