Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c05ecc652a6be…

MALICIOUS

PDF

40.6 KB Created: 2021-05-11 16:38:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f0d670592e847ed854403869d191c62 SHA-1: b4e28ff50bf5733e8b9c1834c98b205f73c0ff6f SHA-256: c33c05ecc652a6be24abf059d36c262581ef2411bde16a04493710afc54974df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and other PDF files, all related to game hacks and free currency, indicating a lure for users to click on malicious content. The ML classifier also flagged this PDF with high confidence. The embedded URLs suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

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/master-coin-free-spin-game-hack In PDF document text
    • http://sfera-express.ru/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/roblox-hack-2021_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_off0000462c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x462C 24064 bytes
SHA-256: ce2f0aa8b05340f923684187ab791ecce2aee9c97ec1137727f7f9b057a89a5f
font_01_sfnt_off00007d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4F 17884 bytes
SHA-256: 2eace5707960ab6674c345fc5925bb74d79b72c9d0e947ec779627780b9711cb

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