Malicious PDF — malware analysis report

Static analysis result for SHA-256 a424ad120b81c1d5…

MALICIOUS

PDF

34.5 KB Created: 2021-06-30 02:26:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a7b5fc7f35007988425a91cb342f757 SHA-1: 089bbe545bd977856101c03fd6b2f41d08f7e245 SHA-256: a424ad120b81c1d50dc738469a227ee78706e59b25a22c5a9fff88b489a69ea7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to 'free Robux' and 'game hacks', impersonating brands like Facebook to entice users. It contains multiple embedded links, with the primary one redirecting to malicious infrastructure at http://netcdn.co/app/431946152/free-robux-ohne-handynummer-game-hack. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a phishing or credential harvesting attempt.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/free-robux-ohne-handynummer-game-hack.
  • 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.co/app/431946152/free-robux-ohne-handynummer-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/army-roblox-free-play_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-in_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ho9w-to-turn-roblox-exploit-lego-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-promo-codes-2021-february_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-no-human-verification-2021-real_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-gamepass-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hack-999999-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/android-roblox-robux-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
font_00_sfnt_off00002ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE4 22304 bytes
SHA-256: 37abcaaaa9c495cf4df72bf41e31c3f6defd72d8ea0f9f697f23bbf79060bcfe
font_01_sfnt_off000060a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 19496 bytes
SHA-256: a3f267b67e527d9fa0836bf97308e36a3ced45c3498e0de69a2b06dd1e8a66c5

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