Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38c303272e45a1f…

MALICIOUS

PDF

55.5 KB Created: 2021-06-13 17:39:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc1e860d5dd40a2dcb0e08f99435a00e SHA-1: 2595552b51da03ac7c3932b875c3e0be99858bb0 SHA-256: e38c303272e45a1f8c2895388a59492aada13f9417d0db71ce0826c7ba5ed752
260 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. These links redirect to known malicious infrastructure, likely serving as a gateway to further malicious content or exploits. The document's content and structure strongly suggest a phishing or scamming attempt, aiming to exploit user curiosity or desire for in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9306

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/431946152/how-to-use-script-hacks-in-roblox-game-hack In PDF document text
    • https://mbbs.hr/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-robux-hack-no-survey-youtube_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-in-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-cheat-in-roblox-obby_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F14 36032 bytes
SHA-256: add5a19e4dde6a583b731c301bd8280f098c4018605ffe6efab8b9a8924976b4
font_01_sfnt_off00009d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3E 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000a724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA724 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000b436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB436 18932 bytes
SHA-256: bb47a048b98b8e4c11e066031a1fae6d61f3f922e5f03d8971bd8a6e8f90779b

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