Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1365015c4df0d03…

MALICIOUS

PDF

43.0 KB Created: 2021-05-16 15:31:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0ed75e96b10489d9e6e7e1347d56bfba SHA-1: 71fec28b36c93e642e64e3fe59c690cacd16ec8b SHA-256: f1365015c4df0d03cd7e129c70cfb6141142ccec41fae5e7636fbf16adaa223f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and free in-game currency generators. The document body and heuristics indicate a lure to click these links, which likely leads to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/if-you-delete-minecraft-can-you-redownload-it-for-free-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-support_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://education.minecraftIn PDF document text
    • https://youtuIn 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_off00004cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CEC 24968 bytes
SHA-256: 1479da42c2f90bbcd48688d96e15d146fcdfdecde3b1eb3ac4a5eed266a5186c
font_01_sfnt_off00008508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 18592 bytes
SHA-256: 18962371c76fb720bd28e976e47cbcb39c5d47198828412c269f5aef32a49cfd

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