Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d7df78da1b0fe1…

MALICIOUS

PDF

35.2 KB Created: 2021-07-19 04:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9691a57ac76324f21ba589aa338d707 SHA-1: 7012f472448cb1685916d7b4adae4ba8052a4fb4 SHA-256: 77d7df78da1b0fe1a7d500fe089d1ff7464c2eeafbb0c118a5e7bfb042b64b0a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and other suspicious domains, masquerading as generators for popular games like Coin Master and Roblox. The document body and embedded links suggest a lure for users seeking free in-game currency or hacks, which is a common social engineering tactic. The presence of multiple redirector links indicates a high likelihood of further malicious activity or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-spins-for-coin-master-2021-game-hack In PDF document text
    • http://addair.co.uk/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://addair.co.uk/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://addair.co.uk/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://addair.co.uk/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://addair.co.uk/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://addair.co.uk/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://addair.co.uk/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://addair.co.uk/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://addair.co.uk/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://addair.co.uk/images/daily-free-spins-coin-master_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_off00003273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3273 23548 bytes
SHA-256: 23d59f50785e21e64e5c2dbb208d7b2e8753f602a291948d789dfb375659baf3
font_01_sfnt_off000067df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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