Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a458f8e695bf614…

MALICIOUS

PDF

33.2 KB Created: 2021-07-05 10:24:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5cb35867751f7d0f7126647c81e4fa03 SHA-1: 6aa4a838dba97a29e571ffbf6ecc6a6d77d5e654 SHA-256: 1a458f8e695bf614c67ec62c3db9aa0b8dde928c5b8302d11a769945610c4a0d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/earn-free-robux-for-roblox-game-hack. The document body and embedded URLs suggest a lure for free game currency or hacks, likely intended to lead users to a phishing or malware download site. No scripts were extracted from this sample.

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/earn-free-robux-for-roblox-game-hack In PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-free-robux-generator-exe_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/where-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-gray-pants-roblox_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/pokemon-go-free-2021-tier-list_GM1094591345.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-hacked-for-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-marshmello-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-get-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-cheats-like-rcm_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
font_00_sfnt_off00002dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCB 21608 bytes
SHA-256: 6dac402f83b07c0047b84abbbdfe6073cffa9ab5ed84cd3f215ec7404dc99bed
font_01_sfnt_off00005d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3C 18788 bytes
SHA-256: 098180cd614d2624df7268bdc42eb390b3940660e3b4a5d90fd1bd8a19720ac8

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