Malicious PDF — malware analysis report

Static analysis result for SHA-256 8733e63f7a663191…

MALICIOUS

PDF

47.5 KB Created: 2021-05-12 18:55:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 14f4e719d6fe3f40ccc8d328b2cbf588 SHA-1: d7b8d4cfe38637e2d0d0a14d9dd223105ab2f6a8 SHA-256: 8733e63f7a6631918931cef5bbc1f63883a5635ae29c44861441b538dad0d80f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors that promise game hacks and free currency, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious infrastructure, likely for a phishing or malware download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/406889139/download-coin-master-free-spins-link-2021-today-game-hack In PDF document text
    • https://pneukalousek.cz/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/robux-free-c_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-link_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC0 24420 bytes
SHA-256: 9d258435068ca8881bafa257d7491f5f7f89109edd3b1bd473c1d58a9937ad32
font_01_sfnt_off0000846f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846F 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off000091f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F6 19956 bytes
SHA-256: 74d155c781bcb346cdc2e89d708ce95ddf39e0b6b23135acde3d469cf70b0471

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