Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18c04012903668f…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 11:47:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b2f4e80c12d855a67b7f3bd36fc6f90d SHA-1: 09c7eaf8ca16b3415d81cbe7c641ad4f64a5564d SHA-256: a18c04012903668f997881aaa2f8705f1f1a92bd58e8de5c47ae364085bbca56
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors and IP-based URLs, masquerading as game hacks and cheats. The primary lure is for 'Coin Master Free Cards', directing users to 'http://netcdn.tw/app/406889139/coin-master-free-cards-game-hack'. The document also contains embedded links to various Roblox-related cheats and hacks hosted on an IP address, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-free-cards-game-hack In PDF document text
    • http://118.98.227.172/opac/repository/cheats-for-roblox-2-player-wizard-tycoon_GM431946152.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/free-roblox-bc-code-generator_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/como-tener-hacks-en-el-wild-revolvers-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/redeem-roblox-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/best-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-gift-card-codes-not-used-october-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-the-livind-dead-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/script-hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-into-coeptus-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-sea-star-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-hack-real-no-survays_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-ultimate-driving-westover-islands-how-to-get-free-cars_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/robux-tool-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-download-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-speed-hack-in-jailbreak-roblox_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_002_off0000308a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308A 23048 bytes
SHA-256: 831e5f79f68b445a98591b35e4839843fbb3c84845dda87e900e4454763c2658
font_01_sfnt_off00006487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6487 18172 bytes
SHA-256: da47515c3b4c9ce74a6a7925be58a2cec6625ddcee19f7c3d533689243930cbf

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