Malicious PDF — malware analysis report

Static analysis result for SHA-256 7557e728ac8a710c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 20:59:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3d62aa126706c7eeda677d92f7bd3ff1 SHA-1: 6776471fe3dafe324e199a7fb11b5ad58c8eb0cc SHA-256: 7557e728ac8a710c7aac46b8768713e4b4361b16c93787dfe21d41e9e7519e70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games and platforms. The ML classifier strongly indicated maliciousness, and the presence of a visual download button further supports a deceptive lure. The document body, though partially corrupted, contains URLs that align with the heuristic findings.

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/835599320/when-tiktok-free-download-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-live-giveaway-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-high-school-2-money-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/20210-pubg-uc-in-indian-rupees_GM1330123889.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-promocode-that-gives-you-750-000-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hack-roblox-hack-online_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/pokemon-go-free-hack-apk_GM1094591345.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-link_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AD 22528 bytes
SHA-256: b85390601624ebf8909c1bcbeb3ecef30bda6d7e1635beef85a06aacb43541b6
font_01_sfnt_off000063f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 18916 bytes
SHA-256: 2162a7786632d71f2bb6d3051fbd845d067ad9e619da3ce3084eb02619b67ed4

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