Malicious PDF — malware analysis report

Static analysis result for SHA-256 349e5eb6532b604d…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 11:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 76b933e31f5e252a15df402edfa85133 SHA-1: 95317ffd6094df6814d3d17f40cf669221f9bb98 SHA-256: 349e5eb6532b604d2880c079eb295e0ab0f240dcd1541a836d6e454219c2b7b5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks'. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. This suggests the primary goal is to trick the user into visiting a malicious site, likely to download further malware or engage in credential harvesting.

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/406889139/free-spin-and-coin-blogspot-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-ml-link_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_off00005167.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5167 25708 bytes
SHA-256: 460af76b19ca4f7a6a9e79a2e4607e68a9433aa9089421166904b7652eced36e
font_01_sfnt_off00008cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD3 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9685 18412 bytes
SHA-256: cb02a0a7339bbfb7c1b17cd559942ff19a97950a5bd5d5859ed5395f6b052c82

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