Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc5ed3d2fd00c7…

MALICIOUS

PDF

46.5 KB Created: 2021-05-12 22:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6d66174eb42f3674ca1a3f50bd1e9f2f SHA-1: 44e8595d05612e2063f455943aaa982b532cf604 SHA-256: 1fdc5ed3d2fd00c7e63e09132187a6db4b55ce9c1904eafa9d38484d1608396c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/406889139/coin-master-free-account-game-hack PDF link annotation
    • https://kalendarite.eu/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://kalendarite.eu/images/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-on-facebook_GM406889139.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_off00004cc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC0 26588 bytes
SHA-256: 08fe993aafc5e80ad10a705255a4a03dcee295b75f9b4a9cfd857e1775939029
font_01_sfnt_off00008aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAE 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9498 17848 bytes
SHA-256: 81db58af0d0a7c54bfcbf00b0a30aba5f5662412ae545e00ecca40055587a372

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