Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c71da21faefba9…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 11:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8be39f049f8c0c393e6b1427772becf3 SHA-1: 51b9a4a0debe1e45a5dc60051dd3e4bfea05e871 SHA-256: 32c71da21faefba9a73411304d930740859e452627edecb68afaa193bfecce54
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, many of which are SEO-optimized PDFs. The primary redirector URL, https://netcdn.xyz/app/406889139/legit-coin-master-hack-no-human-verification-game-hack, is associated with malicious redirector infrastructure. The document body and heuristics indicate a scam related to game hacks and currency, likely intended to lead users to further malicious content or potentially exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/legit-coin-master-hack-no-human-verification-game-hack In PDF document text
    • https://mbbs.hr/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-mobile-hack_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_off0000465a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x465A 24896 bytes
SHA-256: 155f59769aad703db84b24b6e0345cf80d5fa1d54f250ce55214a0d6c6c6e03e
font_01_sfnt_off00007f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F87 18540 bytes
SHA-256: 944ef90ac3957acf4ab0155e17f54942f1cad929ef859b36db5d7006f4b781e4

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