Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c66e4417d4e1978…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 20:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f6593b107ee7a8b5b625e9de9c3b1592 SHA-1: 199c446a9db99db1b7666e62516563616be8f37b SHA-256: 5c66e4417d4e1978273cb573a7c4a7e50026e2c6a64e9ef9377fc7f052aca482
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are structured as PDF files themselves, suggesting a link farm or SEO manipulation tactic. The primary lure appears to be related to free game currency or hacks for popular games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of a 'game hack redirector' URL further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/black-tank-top-roblox-free-game-hack PDF link annotation
    • http://ansacare.com/images/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-robux-for-free-on-xbox-one_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-no-joke-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/link-coin-master_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-cards-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-no-offers-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-no-survey-2021-june_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/is-it-easy-to-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/is-minecraft-free-on-ps4_GM479516143.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_off00002fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBF 22028 bytes
SHA-256: c3690bd4989cb41947695540b029e41fcb2c37e5d5b3ace087750073f37458b9
font_01_sfnt_off000060cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 18808 bytes
SHA-256: af150af5d39fe3e822028ad2b9f2f1cc3963d796b33f3e2d7545fddde603f076

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