Malicious PDF — malware analysis report

Static analysis result for SHA-256 649efd146c627279…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 08:02:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17cda54d1d2cf41c3b871c1ab7db70f3 SHA-1: 8e67ef6a497208f75f521cb48db56eefa763fe09 SHA-256: 649efd146c627279780c23c2d2efc8338737738f50c6441ca68a4119370a604f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links disguised as game hacks and free currency generators, which are known lures for malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged a request for recovery secrets, indicating a phishing or scam attempt. Although no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to redirect the user to a site that may download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/406889139/hack-coins-in-coin-master-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-spins-for-coin-master-2021_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_004_off0000520b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520B 24632 bytes
SHA-256: 9110cd0847029da715a004c18933378c6eebf986877230b67b0863a6d33845c4
font_01_sfnt_off00008a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A74 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000945f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x945F 17716 bytes
SHA-256: d6326db3ec99cd4100037f6b174e8e4c98e0cb74152143630739ed649c35c1c8

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