Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa24aad0966399c4…

MALICIOUS

PDF

34.0 KB Created: 2021-06-24 10:59:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 682148afaed70417ac51c7a73a5ff1c7 SHA-1: bd04b2162422f7bd34dc67a519f8a2f83bc5f880 SHA-256: aa24aad0966399c445b761aae7aead854316525e852a953ad2d02e33398808ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially garbled, also contains the same suspicious URL, reinforcing the lure for free game-related items. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/free-coin-master-spins-blog-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/2021-robux-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-rocitizens-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-support_GM406889139.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_002_off00002ec2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EC2 22876 bytes
SHA-256: 304f3756d23b5c588269980b8c99bacaecc218832d04191295d8c17002cfbaab
font_01_sfnt_off000061ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 18464 bytes
SHA-256: 4bcaff5a2789d7186c9fa4ee96d365b8eba602a20bbe86fe3da838c25a781984

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