Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e4905f5c9b41d0…

MALICIOUS

PDF

47.4 KB Created: 2021-05-12 00:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 519d34cf9095a80bf23c1bbf7a06db70 SHA-1: f05e024ac2ecab436068edf424f6507c58c40fcb SHA-256: 71e4905f5c9b41d032dc3d5d6c1e8adf839fb426600fe9db112bc642a246c43e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux hack generators' and similar game-related cheats. The document body, though partially corrupted, contains references to these lures and the malicious URL. The presence of these links and the ML classifier's high confidence score indicate a phishing or scam attempt designed to lead users to download potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • 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.
  • 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-hack-generator-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/i-want-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/10-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/wahoogaming-co-free-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_003_off00004776.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4776 29968 bytes
SHA-256: 44b21a6ede810398df509c5eb2c041d9fd3855008baa87852271c971e2d69906
font_01_sfnt_off00008c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C15 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00009641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9641 18516 bytes
SHA-256: ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b

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