Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b223b35339a6644…

MALICIOUS

PDF

46.4 KB Created: 2021-05-31 03:00:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d70bfcaa1e22c085559ba715e675ce40 SHA-1: c0db11d4e022b7d86f9b084d54253907cc5175b8 SHA-256: 9b223b35339a6644f95afbb278b55d8bd029ff232c2632bd8cd3fb89a9142174
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 0.9856

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/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack PDF link annotation
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://priveecard.com/wp-content/uploads/fsqm-files/how-to-hack-to-get-robux_GM431946152.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_002_off0000459f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x459F 28536 bytes
SHA-256: 0006a0b769206d54258f3db163d3a29ab3ca8e52131e27749df83774d9591eb6
font_01_sfnt_off000085ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EE 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9D 19428 bytes
SHA-256: dfc7ca414cfca4f80301273998e01ceb4bfd22e3de883fcbe9d6a0102e8d41a4

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