Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1e078e54ea6f9f…

MALICIOUS

PDF

43.2 KB Created: 2021-05-10 15:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc151893158d3716b20a1a5cd4983b6d SHA-1: 3ea8f8f09127048404ff0139c425b232a9a9dc1f SHA-256: 6c1e078e54ea6f9f9bc2b223a6f2ba5c80eb3e135fad18ae1c44f12254494871
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external websites, including a primary malicious redirector. The document body and heuristics indicate a scam related to game hacks and free items, likely intended to lead users to a phishing or malware download page. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-spins-link-blogspot-game-hack In PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/robux-free-gift-card-org-hack_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_off00004bfb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFB 25232 bytes
SHA-256: d5028c060072773f62509d4ce76dc514817b304ab257537514a82101257c5891
font_01_sfnt_off00008564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8564 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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