Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b66ee5fbebec1c…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 07:37:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9c8ea426138c3673f6bccf057f44209e SHA-1: 55f37db68a694f85d9e70d696e1f90c88e7a474f SHA-256: b1b66ee5fbebec1c278b7a84c8421b9fe4bf6d79d5dd7d73679ca6a84b0fb7ea
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to external sites, including a known malicious redirector, suggesting a phishing or scam attempt. The document body and embedded links strongly indicate a social engineering tactic to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-100-spin-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-items-in-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_004_off00004ca2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA2 24976 bytes
SHA-256: 92d2bc49c9aaa592538a36265f0e3b7b926605ed54dbd92308c1bc607b350382
font_01_sfnt_off000085ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AC 18000 bytes
SHA-256: 01f803363f7eeb4dce0f816621254ac49837589185e144589db73f807fad6798

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