Malicious PDF — malware analysis report

Static analysis result for SHA-256 334472da3d5167b6…

MALICIOUS

PDF

33.6 KB Created: 2021-07-03 15:21:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 715753fe8621d2945f5d8c19ad51ebed SHA-1: 1736edcd02c20b0c6b02d34837be544585fa9a6e SHA-256: 334472da3d5167b68c01d7507a63af987a5991b77bc9e4f23583b4e061b3288d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the heuristic firings indicate a social engineering attempt to trick users into visiting potentially harmful sites, likely to download further malware or engage in scams.

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/free-fire-coin-master-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-global_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-candy-decal-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-change-your-roblox-username-for-free-2021_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_off00002fbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FBB 22416 bytes
SHA-256: 4e9180edc1c33e65f6ef6f1fa050aed6ba3fde78e3ec3ef4663f92876bf00c3e
font_01_sfnt_off0000619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 17996 bytes
SHA-256: e30598b03c2a242ee1c87ad3ced89da46b699558fa87167cf151bb2d87213d18

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