Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d3119df01f696…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 12:32:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d2552a07bd577d7737b6d05ae2e8dd1c SHA-1: 587a10d6efd42f6fb5a652690632e5cfd1c14fe2 SHA-256: e99d3119df01f696b3788f2a43375389dc0dcf2032e5398045ae2d3e8df0a702
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency, directing users to a malicious URL. Heuristics indicate the PDF links to known malicious redirector infrastructure and uses a download button lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/free-robux-that-actually-works-2021-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/what-is-the-fastest-way-to-get-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-tiktok-hands-free_GM835599320.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spins-coin-master-app-ios_GM406889139.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_off00005179.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5179 25980 bytes
SHA-256: f56c41da520fc1d985cb7fd0e9f9bcd1844f09d73a7b627d0b72456be21944b9
font_01_sfnt_off00008bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC4 19536 bytes
SHA-256: e162f10ab45425f1911b766a767f4688be22e04cba15be94f938466a51fc2df0

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