Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f128d72be1f8f42…

MALICIOUS

PDF

51.1 KB Created: 2021-05-11 03:32:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1200903fa661224fffe6d1c616598fbc SHA-1: 9cbd3f4aa9fca93d0e8189baea21f4ddc9ab397b SHA-256: 0f128d72be1f8f42944fc39e2445308030909b4277a07d9fb864e9f7642f33bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically promoting 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which then redirects to potentially harmful sites. The ML classifier also flagged this PDF as malicious, reinforcing the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

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.xyz/app/431946152/free-robux-no-offers-game-hack In PDF document text
    • http://www.centralbarbershop.ru/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/robux-giver_GM431946152.pdfIn PDF document text
    • http://www.centralbarbershop.ru/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFD 28872 bytes
SHA-256: 8d8586caff8e5cf2e63e278a7376b264f9cc77751d9eb34a5536483d61be3219
font_01_sfnt_off00008c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6D 4044 bytes
SHA-256: 5196410bcdfc72ecb4ad7d922073bb6d34bf55d37084e4ffe688bf66f2d13d53
font_02_sfnt_off00009991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9991 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA639 18012 bytes
SHA-256: db6be32425767485114cb9000642ed63280f0807e0fe45793765b8e181fce2c0

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