Malicious PDF — malware analysis report

Static analysis result for SHA-256 167bfd5944ac06e8…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 23:22:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac3ae86079e6f107aaad960aeb175431 SHA-1: 227677df40d957a981b3ed4780bae49928d21618 SHA-256: 167bfd5944ac06e89e8db5c0449d0a11405d319bd972a498def244feeb935cae
200 Risk Score

Malware Insights

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

This PDF document employs a lure, impersonating PayPal and promising free Robux, to trick users into clicking a malicious link. The link redirects to infrastructure known for malicious activity, indicating a credential phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-without-downloading-anything-game-hack.
  • 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.online/app/431946152/free-robux-without-downloading-anything-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-do-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-pubg-uc-hack-2021_GM1330123889.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-stars_GM406889139.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
font_00_sfnt_off00005484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5484 25028 bytes
SHA-256: 0008d672f21be12c386bbb432d65703bd651df76c84ae2d1327377208a39ff8f
font_01_sfnt_off00008d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D94 19880 bytes
SHA-256: 6bc5cab104a17e5be196146aaeb40b5940258b3e295a46c016ac1ce7c3ec9493

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