Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1a0d1fbfd143f6…

MALICIOUS

PDF

44.5 KB Created: 2021-05-11 04:00:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ca7e632e04859f6255b7a41ae04af4bb SHA-1: 1e388cadf1b72f266a0153fd313ec3cde076a88e SHA-256: cf1a0d1fbfd143f654ce60ae475a6f69928a39880956f3024d8cab8f097a5161
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a lure for 'free Robux' or 'game hacks' to deceive users into interacting with malicious links. The primary malicious link identified is https://netcdn.xyz/app/431946152/free-robux-generator-no-survey-game-hack, which is flagged as a known malicious redirector. The document's structure and embedded links suggest an attempt to lead the user to a site that may host further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 https://netcdn.xyz/app/431946152/free-robux-generator-no-survey-game-hack In PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/picture-roblox_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://quatangphongthuy.vn/upload/UploadFiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7B 27648 bytes
SHA-256: bbcf75a3ca648a5b7d51f04b369651b89c9e2e6cc1f07b635571d91540b08192
font_01_sfnt_off00008a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7C 18640 bytes
SHA-256: ad191ebdc752795a68e543012f45afbe5bb028a9d541ff585eccff59a545038c

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