Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e53cc6d4324b1e…

MALICIOUS

PDF

50.5 KB Created: 2021-06-07 12:52:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8fd9119144f2e421853104f7f501c788 SHA-1: 0bd05ff6403a2e2685a500d9639023f8847d0dcf SHA-256: 45e53cc6d4324b1ec251ecdfc1d0ad9c12efb0a132c3ad2bc355d4b1f9e7c6e4
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as PDF files related to game hacks and free currency. The primary lure appears to be 'hacks-para-roblox-online-game-hack', directing users to a suspicious domain. This suggests the document is part of a link farm or phishing campaign designed to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/hacks-para-roblox-online-game-hack PDF link annotation
    • https://www.stayon.no/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-get-games-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/pubg-uc-shop_GM1330123889.pdfIn PDF document text
    • https://www.stayon.no/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/microsoft-free-robux_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_004_off00004f8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8B 39068 bytes
SHA-256: 1fb9f5289f5e02fe793428248277ab1063df9c89d49498c322b03ab398f670bb
font_01_sfnt_off0000a2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F2 18456 bytes
SHA-256: 8dbd4decdc95f3084f69f1bc93adbc4ccd7c000b3c1a2b7c407cc744b3f86077

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