Malicious PDF — malware analysis report

Static analysis result for SHA-256 1598879e84c3104e…

MALICIOUS

PDF

32.7 KB Created: 2021-07-20 07:11:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dbef67a95ab54ea5ac34423d1916fa4f SHA-1: 551abe0b7a95da706cb72a9adf60427e29e14b71 SHA-256: 1598879e84c3104eb8292d4a03666ce7e1cd9d764caa8aafb4f8aaa6c3699cf6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting "game hacks" and "free spins" to lure victims. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious websites that may host further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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-spin-codes-game-hack In PDF document text
    • http://krumerhaus.at/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-real_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_off00002a06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A06 23280 bytes
SHA-256: d542b7de172a7740d25314034d532cb338a9056e020d9f4f4853644856aa2f40
font_01_sfnt_off00005e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E98 18060 bytes
SHA-256: 6c6954b9f81c735a5c4580de4c42457a99792272849cec4d30b191d18cdb5601

Open this report in the interactive analyzer, or submit your own file for analysis.