Malicious PDF — malware analysis report

Static analysis result for SHA-256 da619874c41fef58…

MALICIOUS

PDF

45.3 KB Created: 2021-05-16 15:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 247f61f38e5cb009b6fb9e6b2b3e1ed4 SHA-1: b92d6f83e2f953bea3965637b4b51082e29be9a0 SHA-256: da619874c41fef5840aeabc48a3ce2caaa21dbd6bd3cd2dfa042a217ab9a0aa2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to redirect users to external websites, many of which are associated with game hacks and free item generators. The heuristic firings indicate this PDF is part of a link farm and contains malicious redirector infrastructure. The primary lure appears to be related to 'Coin Master' and 'Robux' generators, suggesting a scam or phishing attempt to monetize user interest.

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.
  • 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.
  • 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/406889139/how-do-i-get-free-coins-on-coin-master-game-hack In PDF document text
    • http://www.e-lysis.com/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/mcpe-116_GM479516143.pdfIn PDF document text
    • http://www.e-lysis.com/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.e-lysis.com/images/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://www.e-lysis.com/images/como-hackear-el-juego-coin-master_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
stream_003_off00004c8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8F 30716 bytes
SHA-256: 49911f4d7d3421c236286dc29c6a6933c4842937d73d3ba8d28d504b4b088041
font_01_sfnt_off00008fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB9 18044 bytes
SHA-256: b0174b7273dd3697a995ce39da4c1069e2dc5f33a377c5b822b1ade397e01d0c

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