Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc731407f12c02b3…

MALICIOUS

PDF

43.0 KB Created: 2021-05-16 08:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c3e02623a6b8b18b8301ce9317770db SHA-1: a310893fab829b5a09cab808efa4f1254318bf92 SHA-256: bc731407f12c02b3e4e8e87dff5c103e3ed5bb7a3031fdfcf33733911434776e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" or "free Robux" lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-without-doing-anything-game-hack. The document body and embedded links suggest a phishing or scam attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-do-you-get-free-robux-without-doing-anything-game-hack In PDF document text
    • http://atrax.hr/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-roblox-credit-for-free_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
stream_003_off00004658.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4658 26116 bytes
SHA-256: b2d1eeacb943878435bc8db6d2c3b71020242a92ccf54bcd38d77cbe06911787
font_01_sfnt_off000081e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E9 19564 bytes
SHA-256: f288fbb1ab92d6f8be6652009a81e99b9e02fb437604b8cefd24a0b2528ef73f

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