Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b723a2770c52dd0…

MALICIOUS

PDF

39.5 KB Created: 2021-06-30 01:33:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 689affe5cadc2d27a6a4462c5a46fb22 SHA-1: 136d9276468385e85755732bea30d81737513944 SHA-256: 0b723a2770c52dd08fe279ae5d3b0098c54a10ad1b5433b04fc80346198d8327
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/military-outfit-roblox-free-download-game-hack. The document body and embedded links suggest a lure for game hacks or generators, a common tactic for distributing malware or leading users to phishing sites. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://netcdn.co/app/431946152/military-outfit-roblox-free-download-game-hack In PDF document text
    • https://knj.com.tw/image/data/files/free-good-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-stop-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-apk-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-hack-into-roblox-scam-bots_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/100-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-hack-page_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F21 23160 bytes
SHA-256: 2230410008335ae287ce52b1c7510d1b84134ef56a3de9a13057fe59837fb7a8
font_01_sfnt_off00007324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7324 19896 bytes
SHA-256: 73f0549553505f73e51f41d8ec48eb67955074afdad87f867f644b2e0a14660f

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