Malicious PDF — malware analysis report

Static analysis result for SHA-256 25edd525edfbba8d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 16:05:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 62af2d5bd9947e2c88ad97d3310d3e15 SHA-1: 6be4f73779a59bdde633595860248eb24b7b316c SHA-256: 25edd525edfbba8db487908feb624b5eb25209b43761ca1fb72aca9a60c8b96a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, advertising free spins and hacks for games like Coin Master and Roblox. While no scripts were extracted, the primary attack vector appears to be social engineering via a deceptive link within the PDF.

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/406889139/daily-coin-master-free-spins-game-hack In PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-roblox-accounts-with-passwords-2021_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/how-to-fly-hack-in-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-free-rig_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/critical-strike-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/hack-beta-forces-phantom-roblox_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://www.drsertac.net/upload/content/files/roblox-robux-page_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
stream_002_off000030a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A6 23088 bytes
SHA-256: 30f01f8e88992b06cb4562650b75422a5486dce5724e383b8fdf4ccfabb713c5
font_01_sfnt_off000064ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CA 18596 bytes
SHA-256: f67cf45397c25494501e3e9871b79c38ca25439d2209cefdb99d193c8fd940d5

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