Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c5ba9ee3b7d41b…

MALICIOUS

PDF

50.2 KB Created: 2021-06-08 18:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5896057dc3187c79344c351ecba4b6cb SHA-1: 1aaeb047ad6418df9f0fd39dcb3c282dbda5b2b1 SHA-256: 66c5ba9ee3b7d41ba525394d1c560a07be4735a1715ba6e546ef206778d0570b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as game hacks and cheats. The document body and heuristics indicate a lure to download or visit external sites, likely to deliver a second-stage payload or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/rise-of-nations-roblox-cheats-game-hack In PDF document text
    • https://www.manmed.info:443/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-gun-games-free_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_004_off00005415.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5415 35576 bytes
SHA-256: 1e8793b3d1999709ad276e202a2455eea0b1bd67f8a161ba4aedcb6cfb4e1bef
font_01_sfnt_off0000a1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E2 18404 bytes
SHA-256: c1c969cd3a1351377f9b92ce9b0650249ebf9558e8690e6c00010512851b3f8e

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