Malicious PDF — malware analysis report

Static analysis result for SHA-256 921fb93421018304…

MALICIOUS

PDF

41.5 KB Created: 2021-05-13 23:23:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4b5b48bad5d7eb658a9d8e75388c5b53 SHA-1: 078ff274a5a522096420c49a6777e7d5b0a803de SHA-256: 921fb93421018304b4c0c4dbed410abc420a20fedad169ab4e1ece004667c476
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free game hacks' to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/coin-master-hack-online-generator-game-hack', are identified as malicious redirectors. The document's structure and content suggest it is designed to lead users to potentially harmful websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-online-generator-game-hack In PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/mc-update_GM479516143.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/spin-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/win-free-robux_GM431946152.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_off000049ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AC 24220 bytes
SHA-256: b40209bf5d25aeb7fa00628dcf922cbab971393b35234658c9bb8b2a1c52df6e
font_01_sfnt_off00008120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8120 17788 bytes
SHA-256: f10d9d7ac26b37aa9393865027a0ede53c5b0e24a5f9161d6938870a0e29fed8

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