Malicious PDF — malware analysis report

Static analysis result for SHA-256 71592874a8c184bb…

MALICIOUS

PDF

33.8 KB Created: 2021-07-07 16:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7c48568ce84c8252c4d7c9af21056721 SHA-1: b8fb34f255738227b2d06799546e999a307345b9 SHA-256: 71592874a8c184bb542cedaf7f52207471bab4749dd9597bf93a48ff4a1feec6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically `http://netcdn.tw/app/431946152/claim-free-robux-game-hack`, which is associated with game hack and free item lures. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

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/claim-free-robux-game-hack In PDF document text
    • http://atrax.hr/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-items-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/play-roblox-for-free-online-now_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-robux-on-roblox-2021-no-hack_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/roblox-800-free-robux_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/all-roblox-bloxburg-hack-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/hack-version-coin-master-apk_GM406889139.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
font_00_sfnt_off00002c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C84 22596 bytes
SHA-256: 4906b020a19f2a1e5e48d99c6d349ab678a2365973ef11ed4d4bafefe4308fb1
font_01_sfnt_off00005f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F00 19168 bytes
SHA-256: dfc8721fbf6b4988d00971a58b16fe325011594e1ee6efadf5a4fdcf2df05fca

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