Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1042e5a024504a…

MALICIOUS

PDF

44.2 KB Created: 2021-06-14 01:40:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c76c1c8f7610b9f9694910dbbc3dfd8b SHA-1: 84b679a4ae6374cbeae6da298db5e00dcaf22a72 SHA-256: cc1042e5a024504a41cab1303b36d235b9621d9335836fd28320a5890f18d7d1
142 Risk Score

Malware Insights

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

The PDF contains multiple lures for game hacks and free followers, directing users to external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of linked PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged the document as malicious. No scripts were extracted, but the document's structure and linked content point towards a malicious redirection or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-followers-no-human-verification-or-survey-game-hack PDF link annotation
    • http://huananhai.net/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/get-robux-today_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/hack-download_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/roblox-free-builders-club-account-generator_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-free-admin-hack-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coun-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-change-the-name-of-free-morphs-on-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/como-hackear-un-juego-de-roblox-desde-ordenador_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004764.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4764 24232 bytes
SHA-256: b854fbe3096973df457240bbc201f3f7e6df04855ca424f44949999840b6b4d0
font_01_sfnt_off00007ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBC 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000088a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A7 18748 bytes
SHA-256: 6c56a9102827ae6ceba4f8b38934fd9fcdc3c6624088a0c8a681a3e50045d012

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