Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a002c305be9f87…

MALICIOUS

PDF

45.7 KB Created: 2021-05-16 14:36:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f93c24965636d3096e1a53258d6146c9 SHA-1: a9ca6fe02d5168c97e74a02eb6cd62f78409a0c3 SHA-256: 33a002c305be9f87f961f0dbc319ea654cfa67e61195a5dc68b07de4c1ebc41d
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 0.9507

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.
  • 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/haktuts-coin-master-free-spin-link-today-game-hack PDF link annotation
    • http://www.ma-plast.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-tools_GM479516143.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-realms-free-codes_GM479516143.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_off00004bbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBB 24916 bytes
SHA-256: 947c18beb82f0939e02093f03c379ab387f243e0ed1f35ea98d1cc00d1171abc
font_01_sfnt_off00008552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8552 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3C 18548 bytes
SHA-256: 8a183f727996cc32fbef5b88310e24e7f03bcbd52bbb5fb8fb881fa2948b6bea

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