Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9551076bbdc3ba3…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 12:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 133e90952f6be552a66861f379f38908 SHA-1: fe715a3574a4a099ac96187362cc974188fd8f6b SHA-256: d9551076bbdc3ba3035025d2f6fd1d5d6ae1a5cf2ff36efb014422a8ce57ed4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a known malicious redirector, disguised as a generator for game items like 'Coin Master' and 'Robux'. The document body and heuristic firings confirm the lure of free game hacks and the use of redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful 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.tw/app/406889139/20-free-spin-link-coin-master-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/comment-hacker-roblox-sur-pc_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/alt-tab-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/tiktok-free-view-pro-app-download_GM835599320.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-hack-your-roblox-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-hack-pubg-mobile-unlimited-uc-without-human-verification_GM1330123889.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/dashing-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-adopt-me-accounts_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_off00002ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF2 23200 bytes
SHA-256: 3fe51575b0ad6dec572c10fbb7f8dc398c214dfe3861e1904ad21251975a005a
font_01_sfnt_off00006450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 18640 bytes
SHA-256: 1e3f3b3c18bd14673104f6b6dd19f58d422a9a34ae0bbf2597c81585bf1c1911

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