Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7b37428985a5e…

MALICIOUS

PDF

36.2 KB Created: 2021-07-05 10:03:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 347f2fc4ccb95a36879f6b2d574fae1b SHA-1: aeccc1ce5717b448de410e7b78583888f1bf1eb6 SHA-256: cfc7b37428985a5ec811edc044fc22973848861920041bdd3e9c9ab8f2b415a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious link identified is http://netcdn.tw/app/406889139/coin-master-free-spin-ml-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or redirection attempt, likely to deliver a second-stage payload or lead to a credential harvesting page. The ML classifier also strongly indicated maliciousness.

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-spin-ml-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-maker_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-girl-stuff-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-any-gamepass-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-cheats-computer_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-ot-get-free-robux-not-clickbait_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/survivor-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-ios-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hacks-como-tener-robux-gratis_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/video-free-robux-obby_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/games-to-get-you-free-robux_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_002_off000036d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36D7 23312 bytes
SHA-256: dd7e6a13308bcc0bf2f328fc14d3b9415a4c7bd24ed20f97779cbdd465317022
font_01_sfnt_off00006b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2A 18248 bytes
SHA-256: c18038b999a15e068e0fcec6b3cb299d21e05aa15a09c32d3b19c8c95a871ee0

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