Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c704fe7959d66…

MALICIOUS

PDF

51.2 KB Created: 2021-06-07 07:40:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6f982b85180fd5d7e37055ac374207d SHA-1: 6d445c2d6f16e8cce465dde4dd6fe7937bee2a60 SHA-256: 511c704fe7959d662e8e289726c9de4056a0f4126b45a75251f763cb3b1a8921
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators for popular games like Roblox. The document body, though heavily obfuscated, contains references to these lures and the authoring application suggests it was generated programmatically. The primary attack pattern involves social engineering users into clicking these links, likely to download malware or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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 https://netcdn.tw/app/431946152/roblox-download-windows-7-free-game-hack In PDF document text
    • http://centr-expert.su/images/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-coin-master-spins-2021_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005150.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5150 26572 bytes
SHA-256: 85bc3aee194a59a06b7b4e0a07c34292ae1991b49ffe3f63559b52d656d056d1
font_01_sfnt_off00008e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000097b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B1 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_03_sfnt_off0000a2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C5 19056 bytes
SHA-256: 73d54fd11aca8c90e781ffa7c93af29edc705c85c1d2c98bb96ba7f2176405de

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