Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbd319f0ad0411a…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 20:27:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1e65db74eb11b7536f2ae5dc066e3ad4 SHA-1: d74046aa04da87841c669a6282b375457e3f1284 SHA-256: cdbd319f0ad0411a6aad684559730fb83befe359c335991a7c08628467f1df4a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game-related cheats and currency. The primary lure appears to be related to 'Coin Master' and 'Roblox' hacks, aiming to entice users to click through to potentially malicious content. No scripts were extracted, but the presence of numerous malicious URLs and the ML classifier's high confidence indicate a high likelihood of a malicious redirector chain designed for user engagement and potential further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-iosgods-game-hack In PDF document text
    • http://oca.undil.tl/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-in-10min_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-online-hack-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-the-pizzeria-rp-remastered-coins-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-hacks-strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A1 22700 bytes
SHA-256: 5486599c241c7b6c739e384fead128d01c73f7b81bc7a5386c36029fb0226d23
font_01_sfnt_off0000676d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 18180 bytes
SHA-256: 835919d68baf365dee2eb3881849910c3802b6bb08bb8f403bb4b70701c61443

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