Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58b451064f6548e…

MALICIOUS

PDF

48.1 KB Created: 2021-06-04 04:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 991a385ef706cf4a45139bc23daa18f9 SHA-1: 1ad3559f20be4889080c9f13af68434b88923680 SHA-256: b58b451064f6548efe2d3e0777de9a95772b1a9221c3d4a55d3c4b60994a8a10
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a URL associated with malicious redirector infrastructure. The document body, though partially corrupted, includes the same URL and text related to 'free Roblox accounts' and 'game hack', reinforcing the lure. A fake CAPTCHA heuristic indicates the document is designed to trick users into interacting with the malicious link, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-roblox-accounts-dantdm-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-executor-free_GM431946152.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_off00005395.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5395 25272 bytes
SHA-256: ed727dc0da3c4ce38f838b8d0520bad3cb733e5f08968e27c4a9a2eb31ea3f2f
font_01_sfnt_off00008d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5A 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off0000970a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 19020 bytes
SHA-256: fab1cdea1c90721c250ad49de139f00c3e6c4251d6a59756d793536ca2bf5ae4

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