Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a2dbff5032ca93…

MALICIOUS

PDF

37.4 KB Created: 2021-07-10 03:37:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c92f6aff9203954f60491bd7fb9ea800 SHA-1: 58297bb86200855eed161b7741df71048032734e SHA-256: a1a2dbff5032ca9361966a434eb6c960b377d749ccbbed6e42620ba26dda900c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising 'free game hacks' and 'free Robux'. The heuristic PDF_GAME_HACK_REDIRECT_LURE directly identifies this lure. The document body, though partially corrupted, also contains the malicious URL. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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-robux-group-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/tiktok-free-hit_GM835599320.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/cant-press-custromize-button-on-unjailbreak-hack-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robloxcom-free-kkk-k-k-k-k-m_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-come_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-anti-speed-hack-devforum_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-without-downloading-apps_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 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
font_00_sfnt_off00003b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B07 22788 bytes
SHA-256: 32546cfc2ca5e763b1961a3bcc487ee2a636d6a27f013858ea47ce6b20e6c422
font_01_sfnt_off00006dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCB 18892 bytes
SHA-256: 67507f51078b9d360364fd80bede771b0831b8cadce387b59c9348d966d9fcb5

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