Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c79df8bf34ca4d4…

MALICIOUS

PDF

35.2 KB Created: 2021-06-20 09:53:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1cff56eca7a335e4ff9293a8e950a648 SHA-1: 234774996c71aac44c92957dc5cc83d7f3aed6a8 SHA-256: 8c79df8bf34ca4d4011b3a9388928ae714f3047efd36cd47f37c11fe08232e98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL, which is flagged as malicious. The document body and embedded links suggest a lure for game-related hacks or currency, a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/jail-break-roblox-money-hack-game-hack In PDF document text
    • https://allpromise.com.tw/image/data/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/pubg-uc-top-up_GM1330123889.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-freebies_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-without-scams-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-village-cost_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_off00002fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDF 23108 bytes
SHA-256: b2a88bb473796c61148ea9d1e6224ff73230fbb35e08be953c960dab0f188482
font_01_sfnt_off0000640b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 19320 bytes
SHA-256: a5aaeb11b7b1dece677177934a0e3cbe52e5d7fb79610f2d5fe2dead3743ffbf

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