Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9c4ddf9112375c…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 00:17:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0743fcedc1a3a96cf367d7a49bfff067 SHA-1: 1f4087b0524fcf56d0bdd84418320a4d92bcf7de SHA-256: dd9c4ddf9112375c475ac6efd287c367b1896bc52afecfa64b77616646bd50c4
220 Risk Score

Malware Insights

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

This PDF file contains multiple links to external websites, including a known malicious redirector at `https://netcdn.online/app/406889139/coin-master-free-coins-generator-game-hack`. The document body and heuristics indicate a lure for "game hacks" and "free generators," suggesting a phishing or scam attempt. The presence of numerous links, many with numeric slugs, points to a link farm strategy to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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-free-coins-generator-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000523b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523B 25328 bytes
SHA-256: b59ccf20e00f5d0767a7a90affab3d9daddaa3c718d6f91a394ec2be2690fbd0
font_01_sfnt_off00008cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF6 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off000097d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D9 17712 bytes
SHA-256: f6b7bbb27796bfdd91832c5c9631b2ef3c604ec4967bc220e21b541acce31e79

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