Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d8763b7e3f4b20…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 16:08:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 749dfca4b47fc98ee95087495b7805a5 SHA-1: e5824025bd869867f40f90401b625e18b0c903ab SHA-256: 62d8763b7e3f4b20e7dc4fc08a88f1426072855c2283d35cb52cff2060f2181f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' to lure users. The primary link, https://netcdn.xyz/app/406889139/coin-master-hack-to-get-free-spins-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to similar lures and embedded URLs, reinforcing the malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-hack-to-get-free-spins-game-hack In PDF document text
    • http://rumler.pl/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://rumler.pl/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/i-robux_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://rumler.pl/images/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://rumler.pl/images/can-i-download-minecraft-for-free_GM479516143.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_003_off00004893.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4893 25720 bytes
SHA-256: db5b000f3f31f78a22e97edba45076987e69ed97ea9a2ebe251108dcfe472958
font_01_sfnt_off000081e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E3 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 18056 bytes
SHA-256: 6ebf753f6e2aa75b7f89159318a8360a057196b850713683f584e5709dbcaa9a

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