Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afcd436d8246fa9…

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 04:57:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 290a3eb9bd698abaaae8eb0d43ecbd70 SHA-1: 3476b5ead66d3c723a3215f2c491a606938397de SHA-256: 3afcd436d8246fa94b9f69c48723a9ee5d4770b432becc2dcdd8abe662614c62
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks, specifically for Roblox, and directs users to a URL that has been flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded URL is likely intended to lead the user to a site that either hosts malware or attempts further social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hack-codes-for-roblox-rb-wolrd-2-game-hack In PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-cheat-hack-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-do-u-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/robux-hack-giveaway-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/pepsi-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/hack-para-roblox-facil-youtube_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/cheat-codes-for-bick-cars-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-all-pass-for-free-in-greenville-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/robux-for-free-pc_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-radio-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-do-you-get-1m-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/redeem-card-2021-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/bitcoin-mining-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-old-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-btools-hack-mega_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-survey_GM431946152.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
font_00_sfnt_off00002e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E11 22272 bytes
SHA-256: b33d03cf1c172a60cd01641d6b5f59653252390623e2023803c6b00f722ce8e1
font_01_sfnt_off00005f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 19316 bytes
SHA-256: c1562db4932586c4eda60e161436be118ea0f3c819fe11916f2d6668c43b3bda

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