Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1487c79c634cf4c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 12:45:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fdd7dccef4710c797c2af2162a08bf0 SHA-1: 5255bfa47ad8cc479a971f5b390706947b78cf14 SHA-256: b1487c79c634cf4cc563f6275d553f7613c40a47c9d123f558ac2589fbaae5b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body and heuristics suggest a lure for game hacks or generators, leading to the URL http://netcdn.tw/app/406889139/coinmasterfreespins-game-hack. This indicates an attempt to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

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/coinmasterfreespins-game-hack In PDF document text
    • http://library.umla.ac.id/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-hacks-no-install_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-free-views-2021_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-robux-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/is-using-a-auto-clicker-on-simulators-roblox-cheating_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/what-to-do-if-your-roblox-account-has-been-hacked_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/pokemon-go-free-codes_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-gain-more-spins-on-coin-master-for-free_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_002_off0000305e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x305E 22684 bytes
SHA-256: afc4043e692ae0f0305d1025a3f8dfef6e23855cc5afc5220fcb52a07b8b43d7
font_01_sfnt_off00006334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 18272 bytes
SHA-256: 07d1048110b648044dfdf05b80b578e3dafb2e438d2dd29495699789e7328ffb

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