Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e25c1d259d9c25…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 22:32:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 624aa5e79ff785d2fb6d3ba48e3d32e6 SHA-1: a4959c19bb91e0fc5509708f498c286879b79799 SHA-256: b5e25c1d259d9c25057a03fc05a6ce3580919211e1970d23d6da52c2aea3668d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-vip-roblox-game-hack. This lure is designed to trick users into believing they are accessing a free game hack or generator. The presence of a visual download button further supports the deceptive nature of the document. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-vip-roblox-game-hack In PDF document text
    • https://alimi.com.tw/upload/files/roblox-island-royale-money-hack_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-roblox-apk-mobil_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-free-robux-download_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-roblox-items_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/facebook-roblox-hack_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/wall-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/beyond-hack-script-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-for-apocalips-rising-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robuxs-no-offer_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-studio-free-robux_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F6E 22744 bytes
SHA-256: 386dc3cf533d890bfd84130daeb104de4b045a3f3ae31dc25f78082e6b4527a2
font_01_sfnt_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 19080 bytes
SHA-256: 5cd26e17e9044f55fd2016feb0b7717245efb1602296708d61af1d0891fbbad2

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