Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a93768bd311b0…

MALICIOUS

PDF

44.5 KB Created: 2021-05-10 21:39:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b62c33ce854adcb9e0d64fb6b579258a SHA-1: a026dc247d062acd2a950140f2b88739ee17d283 SHA-256: a85a93768bd311b0476424f0b932372f2c31bd06bdf02b170a965ff93f613cde
82 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to URLs promoting game hacks and free gift card codes, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-gift-card-codes-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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 https://netcdn.xyz/app/431946152/free-robux-gift-card-codes-game-hack PDF link annotation
    • http://yochin.org.tw/images/picture-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000043bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43BB 25944 bytes
SHA-256: c0a4a5d34d53e41156eddd95211d157aaeb7b6a6f4e6e357a4edd58fe8518ef6
font_01_sfnt_off00007fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC0 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off000089ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EC 18640 bytes
SHA-256: ab9c735b01157041a26a1754a1ceb43d7e93b9bb6de5cba43436a791952d9cfa

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