Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bad4d7c242b4f6c…

MALICIOUS

PDF

46.5 KB Created: 2021-06-08 20:59:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f2ab5b646a357d1f99e325098faa1fa1 SHA-1: 2f79ecdcb7ae01ca735149516efe25c8aeabbd7e SHA-256: 9bad4d7c242b4f6c1dc339bd6adda8aff4f3f0abf9ddb5af9657cc49dbd6303b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be free game item generators or hacks. One primary URL redirects to a known malicious infrastructure, and the document body contains numerous links to other PDF files hosted on limebug.com, suggesting a link farm for SEO manipulation or further redirection. The presence of these lures and malicious redirectors indicates a phishing or scam attempt.

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.
  • 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.tw/app/479516143/how-to-get-minecraft-windows-10-for-free-2021-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/pokemon-go-free-7-km-eggs_GM1094591345.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-human-verification-no-survey_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/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-link-hack_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_004_off0000584f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x584F 26056 bytes
SHA-256: de9fab4ffaffc95912d22d8ce16b5d4ac18d44395cb5084a691591145681cfdf
font_01_sfnt_off0000924d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x924D 18648 bytes
SHA-256: 354bb2c2c4fae14b5c7df711c8f5a389dfe67cd832e4a835714c7b2f7ea7fa4d

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