Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f40b7bebc9e935a…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 14:59:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4fc58879dd459d77a232fc68b17e3d96 SHA-1: 1e1aad19f7fd94e3a316d1f6321df98383825705 SHA-256: 9f40b7bebc9e935ae5a7abe78f93150e558e31fc2dbdf9751c52a4b3fee4cc68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links that redirect to a known malicious infrastructure, specifically promoting game hacks and free spins. The ML classifier also flagged this PDF as malicious. The embedded URLs and the heuristic firings strongly suggest a social engineering lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/i-cant-get-free-spins-coin-master-game-hack In PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/can-pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-send-free-spins-on-coin-master_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_off0000508a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508A 26268 bytes
SHA-256: cc4fb818a64c63c7f9b3584ff4e6583ee69493aba60a9f323374082724b484e1
font_01_sfnt_off00008cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD3 17884 bytes
SHA-256: 5820efde9e5fe16aed3c977de96073b5a9ded1f6c80170346f50cb4654f88eb8

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