Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc465b0314f5ed93…

MALICIOUS

PDF

46.3 KB Created: 2021-05-12 01:07:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5e1d720f2b3fa61d460e403df58db9c5 SHA-1: affb351c62d130d8475ebc8b925056bf53bee92c SHA-256: bc465b0314f5ed935762b0d9ef692eaa53dcf3696f61b37204257e4dde60bb44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free robux'. The primary lure URL is https://netcdn.xyz/app/431946152/freerobuxhack-us-2021-game-hack, which is associated with malicious redirection. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/freerobuxhack-us-2021-game-hack In PDF document text
    • http://zercalo.org/images/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.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_003_off00004b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B15 25500 bytes
SHA-256: 1ba5a42b94c29304d7e793c582904d4dfc6c6ef9ba4f7a2ce1003fd7d14c2adf
font_01_sfnt_off00008605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8605 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF0 19168 bytes
SHA-256: efb3faf8613e574aaafbc2c03eecac9d279c27a31d34e4d9725215b9c75db868

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