Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bc65ff69fed280…

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 14:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ab9c7cfa14bfbd272544297a79e1fe2 SHA-1: a5a01497e445f9622b48e3067cf25bf631ca5b4c SHA-256: 13bc65ff69fed280f84c760d90ac52297fef2f14445f3ee4a3dc9c64c4ffbff4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks' for popular mobile games. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate the presence of malicious redirector links. No scripts were extracted, but the document body and embedded URLs suggest a social engineering lure 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/406889139/coin-master-free-soins-game-hack In PDF document text
    • http://goldwing-shop.ru/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://goldwing-shop.ru/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/freerubux_GM431946152.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://goldwing-shop.ru/images/can-you-give-me-free-robux_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_off00004934.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4934 24984 bytes
SHA-256: 4da3517508b205f24abe346690d1261953ae8494af8ec90069649a5a03c19e41
font_01_sfnt_off000082d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D0 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995