Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef330b0b9af6f726…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 17:51:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 89c2407beb578985d14d8178bdb75e68 SHA-1: 2736988f3900142284065abdac006c9a0dc3b4a6 SHA-256: ef330b0b9af6f7265daa545eae365815479331623067fd03a973072924952ac6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, with a primary one redirecting to known malicious infrastructure. The document body and heuristics suggest a lure for 'free generator' or 'game hack' content, often a pretext for malware delivery or phishing. The presence of a password-protected archive lure indicates an attempt to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/easy-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-app_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-fallen-hacks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pokemon-go-free-pokemon_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/my-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off000032da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32DA 22996 bytes
SHA-256: 67421f44f8905788d5db023f01a04d3b3bd480a10646b866a3c3d94017eaed7e
font_01_sfnt_off0000666d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666D 18732 bytes
SHA-256: 73aa8d0075d35b346c6278ff8105dd2d17954bcce6a7925eca586d45f67dab7a

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