Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e45de5dfa5176f…

MALICIOUS

PDF

44.1 KB Created: 2021-05-17 00:21:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 30a4f1a9ac6e7640065f815fd91facf9 SHA-1: d85d876596df20347ee674a89d9491ee9b8517ef SHA-256: 40e45de5dfa5176f5ded8eec5b00bfe591a96b97244cded22a54249f513c8844
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised with lures related to game hacks and generators. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or redirection attempt, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/479516143/minecraft-build-hacks-game-hack In PDF document text
    • http://apx-centre.ru/images/free-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/mcpe-hacks_GM479516143.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_003_off00004b4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4C 31140 bytes
SHA-256: 25361adb0d37a8d0112ec3f443e17027bc145d187de0bf03121b52e14b4a8041
font_01_sfnt_off00008a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A54 18344 bytes
SHA-256: 504dc7aae18f41d03fb81a40dc2b00347564f3d62703eefd30bc8cf15d610b16

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