Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d5d376400b113d…

MALICIOUS

PDF

47.3 KB Created: 2021-06-08 22:13:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 255a478086ad63706652fb0eb1e4bb5f SHA-1: 66d1cb0a3477e9519fc853aa96bd56ba0281d5d3 SHA-256: 57d5d376400b113d1d44d95be88e21911cfd0feafe935218ec460a79a5235922
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to redirect users to external websites, masquerading as game hacks or generators. One primary redirector URL is https://netcdn.tw/app/431946152/free-private-roblox-server-game-hack. The document also includes a large number of links to other PDFs, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the presence of numerous malicious redirector links and the lure of free game items strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/free-private-roblox-server-game-hack In PDF document text
    • http://www.compusiteinc.com/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.compusiteinc.com/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/roblox-fe-hacks_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/pubg-uc-shopee_GM1330123889.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.compusiteinc.com/images/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://www.compusiteinc.com/images/free-minecraft-alt-accounts_GM479516143.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_004_off00004d65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D65 25360 bytes
SHA-256: f10057f35473d08f2df9320baf32a467795038efcc80398ca7745293065b8846
font_01_sfnt_off000087fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FC 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000950e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950E 18668 bytes
SHA-256: e729a7dc55e837c45a906f7650f325bd3dbf63242e1f25307cfcda8096226056

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