Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8b1c995e399a64…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 04:05:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 001fac389a2c856bb2c38b7e825321ad SHA-1: 95e898106d3cc4992e00e5c5bf97285e59fd94b1 SHA-256: 7a8b1c995e399a64803ff5d5400f630de159554713a70fe5639d950a8976971e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links to known malicious redirectors and SEO link farms, masquerading as game hacks and free currency generators. The primary malicious URL identified is https://netcdn.online/app/406889139/free-coin-master-spins-and-coins-game-hack. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-coin-master-spins-and-coins-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_004_off00005079.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5079 24244 bytes
SHA-256: b3ab0545e23c714be862adba13b239154e0d551b190e9668f35c9b4c7c0e4e40
font_01_sfnt_off000087f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F1 18060 bytes
SHA-256: 55f53c4f18bfaf59a8fbb6d381f980c96a3f4ad908aa3278e43a985984e68094

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