Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc4bcb342cb53ed…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 00:22:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf42975be1a0df11dae505a1ef074a36 SHA-1: 2863780dc77a11f9fe63837659a2dd94de6a8914 SHA-256: 3fc4bcb342cb53ed29884023a838df367220891b8102066e640e830e5a71c892
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector infrastructure. The document body and heuristics indicate a lure for 'free generator' or 'game hack' content, which is a common tactic for distributing malware or conducting phishing. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/406889139/free-coin-master-spins-blog-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-pet-simulator-vidos-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/games-on-roblox-with-free-radios_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cerberus-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/strawberry-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-sex-games-free-entry_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-items-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/tiktok-free-promotion_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-you-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pastebin-raw-roblox-change-name-hack_GM431946152.pdfIn 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_002_off00003315.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3315 22852 bytes
SHA-256: 456930fb62ab946a6832e8c2e838db69f0ce7b7485de5780fdb14f4c04d72937
font_01_sfnt_off00006659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 18464 bytes
SHA-256: 4bcaff5a2789d7186c9fa4ee96d365b8eba602a20bbe86fe3da838c25a781984

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