Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0330ea18d13a3…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 05:22:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 35154ef1fb933bdb1aac497920dd3d9c SHA-1: d0fa5477ba4ff386543cf0e25dd72d9e3ae69cf5 SHA-256: 71b0330ea18d13a3e69a30f2d702ae688fcf5c5d3e68a8a0302781e2306addc9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, also contains references to these lures and URLs. The primary malicious action observed is the redirection to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/how-to-get-free-robux-on-pc-game-hack In PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/hack-admin-roblox-nantes-roblox_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-cydia_GM406889139.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_004_off000050d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D0 26140 bytes
SHA-256: 319ea6b60ad7e789f918cc97884c82bb1906094ebf80e8365faf80083cf278b8
font_01_sfnt_off00008da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA7 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9753 18436 bytes
SHA-256: 3da4067756d8a9659bbf1d91e8f5987ff560a340f178cc4f41ff3c3676747205

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