Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ddda21f0649cf3…

MALICIOUS

PDF

39.9 KB Created: 2021-05-19 07:38:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 02ad319c8b8ff29fd8a5482ad8012f31 SHA-1: 2e1f3adcd4b1b34c1ed1cf510583f9bc7bcfdb2b SHA-256: 51ddda21f0649cf3d568add0286e6000ddd963efe8c1d6f2b19737129d00778f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9971

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/835599320/is-tiktok-free-game-hack PDF link annotation
    • http://glll.de/images/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://glll.de/images/robux-offers_GM431946152.pdfIn PDF document text
    • http://glll.de/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://glll.de/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://glll.de/images/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://glll.de/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://glll.de/images/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://glll.de/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://glll.de/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://glll.de/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://glll.de/images/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://glll.de/images/easy-ways-to-get-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_003_off000044b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44B3 24052 bytes
SHA-256: f63ab3167dbc487666e9769babbc21528f3997b7805d3c3bd49971b42398cc33
font_01_sfnt_off00007bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBD 17456 bytes
SHA-256: 9ac98d03116b0178d2440c8519b51994e916559904e102c6f95e7069a9c516c8

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