Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d64769e2a86af5…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 06:04:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bee2d6ec8f291046898279b97d54485c SHA-1: 7bed029730f4edc6dc5ac15258082033c0f4ffe8 SHA-256: 11d64769e2a86af586d30a57076ca7e1251332702259e07d9c75d65336a773a7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector hosted at netcdn.xyz, which is associated with game hacks and impersonates Facebook to lure users. The document body, though heavily obfuscated, contains references to game hacks and URLs that likely lead to further malicious content or exploit delivery. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to exploit users through phishing or by serving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/coin-master-free-spins-blogspot-game-hack.
  • 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.xyz/app/406889139/coin-master-free-spins-blogspot-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/pokemon-go-free-647_GM1094591345.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/are-pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/tiktok-free-pro-app-download_GM835599320.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/weird-roblox_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_003_off00004af1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF1 24972 bytes
SHA-256: b42525cc10063840f2fa163e2b06c578aa2288f6790fc61d80c87bf96b8ee72b
font_01_sfnt_off0000828c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828C 18464 bytes
SHA-256: 7f13c81e41627db5de1fdc011b77043c9877b216986226f08b9acd2eded814ce

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