Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee57276009a6817…

MALICIOUS

PDF

44.4 KB Created: 2021-05-15 00:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 774b3399e4e738fdb1e235e5e67f91df SHA-1: 0ec693ae46e7564cb0ae8827f962537a1f045a12 SHA-256: 7ee57276009a6817a009959e9c62362c4244bf04f8ab39ab6c3b64c02c3f099e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, including one explicitly labeled as a 'free generator / game hack' lure. The document body, though partially corrupted, contains text related to 'Coin Master Time Hack 2021' and a URL that aligns with the heuristic findings. The presence of numerous external PDF links suggests a link farm designed to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.xyz/app/406889139/coin-master-time-hack-2021-game-hack In PDF document text
    • http://waldkindergarten-abensberg.de/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/robux-website_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/games-for-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004754.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4754 24904 bytes
SHA-256: 53e5d9e5c1dcc62d5910970ed86593ad62fe6c7b2bd3a1e7c98b11f7fb19f7c4
font_01_sfnt_off0000811f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811F 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18380 bytes
SHA-256: d61a4547520ea8cafecc3ed258c73b3244e9bc9b68d98ecd8e3226df3b2774a6

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