Malicious PDF — malware analysis report

Static analysis result for SHA-256 191062edffb112e1…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 19:58:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 82b8f915c5716f1c36696766bf5cd32f SHA-1: 7ee3a5968d65ffbcbfd9555ff23384649cb10f00 SHA-256: 191062edffb112e1cfec47cb2da72e85d16b4512acfce4420deda6cb2a412e30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs, with a primary focus on lures for free in-game currency and items related to games like Coin Master and Roblox. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests a redirection to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt designed to trick users into downloading further malware or divulging information.

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/coin-master-free-snacks-link-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/why-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-dovlovot-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-hugs-roblox-id_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pokemon-go-no-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-using-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/nike-roblox-shirt-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/tiktok-minecraft-hacks_GM479516143.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_off0000307d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307D 22868 bytes
SHA-256: 52b0d5b86e211e7b06632d3f4505e5ee1bcd9fd7ad9a227679bbd60776bba2a2
font_01_sfnt_off000063db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 18168 bytes
SHA-256: 49b3383b0ff20e2977df0bc058e05ba6d34df220f914051dd6e6d9430a583dba

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