Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b1f1cb0126436d…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 19:51:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1aa2ef336b6356a1d0155f18c19ee206 SHA-1: 9354a162a701bd14a3be71f6d27e985bd71dbeb9 SHA-256: c4b1f1cb0126436d566d29e9e20975a716387728b3f5e44fb5d590f3d14a864e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-group-game-hack, which likely serves as a gateway to further malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to harmful websites.

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/coin-master-free-spins-and-coins-group-game-hack In PDF document text
    • http://stitqi.ac.id/website//repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-robux-in-one-minute_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

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_off00002f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F65 22648 bytes
SHA-256: bbf682bfaf0cbdaa0f1a83a3dae4a85750e12bd334872602a55e3ba7741befb1
font_01_sfnt_off0000620c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 18488 bytes
SHA-256: 097f03148461b960bf7dfce38b580b2e2c87eb7891c69634875d30035c126cbf

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