Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b92a59c2dde8b…

MALICIOUS

PDF

43.8 KB Created: 2021-06-07 09:03:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7e8842326c46c050c3d12bc4d42e070b SHA-1: 3f4e58b7f746b4c0f05c4c792b9d6ac2c8038dd1 SHA-256: 167b92a59c2dde8b0b1a9d85902bf1277473dedb2231e7d781d45df7772b6d8f
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as offers for free game items and hacks. The document body and heuristics indicate a lure designed to entice users to click these links, likely leading to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://netcdn.tw/app/431946152/free-key-cards-roblox-game-hack In PDF document text
    • http://umksn.pl/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-cheat-codes_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_004_off000050c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C1 24188 bytes
SHA-256: 13703a21e0eadb719e3345768ab72e9c5dae27e61eb64dacf898ebbfa33651a5
font_01_sfnt_off00008783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8783 18532 bytes
SHA-256: 380b1eb24ae620d92ad8c0b6a74e6adcb7099f0d5eb23090808a544afbea0f97

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