Malicious PDF — malware analysis report

Static analysis result for SHA-256 b528b81963532f8d…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 12:20:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6b8b4a05f9460fe969cca990e7446f5 SHA-1: 9e546b9dacb7072c0c5d2886fd35b32382931bda SHA-256: b528b81963532f8d8fb184d1e86ca752eb2431cdc314e8da439cb808f45a6120
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, that promise game hacks and cheats. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats for games like Roblox and Coin Master. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or social engineering attack aimed at driving traffic to potentially malicious sites.

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/download-cheat-and-hack-for-roblox-game-hack In PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-survey_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-com_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-to-get-robux_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_off000030ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CE 22368 bytes
SHA-256: 0d7b931e10635ca7db09c7fdedcc0fb1634243e317ef9ebd1b89ec82a8d6a7fb
font_01_sfnt_off0000626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 19596 bytes
SHA-256: 414795c5bbccddfecb469ddb9e564b135a744423e25e2348df22c8fac8277bd3

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