Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fd3367276b2c3a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 12:06:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bb87afcd5d5396a79369e1ab81a797f8 SHA-1: 562325556e2aedade8a16d59cf75b0184a6ad0cb SHA-256: b9fd3367276b2c3a8cc5168ec45cb9594ddb1f6c818f6fef50537b90f7d75d78
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and a link farm of other PDFs, likely designed to manipulate search engine results or lead users to malicious content. The primary redirector URL is http://netcdn.tw/app/406889139/fbchampion-game-hack, which is associated with game hack lures. The document body and heuristics indicate a lure for free game currency or hacks, suggesting a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/fbchampion-game-hack In PDF document text
    • http://global-brand.net/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-generator-2021-working-downalod-no-downlaod-oddsfuspanish-translate_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/new-free-items-on-roblox-promocode_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-make-clothes-without-hacks-or-bc-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
font_00_sfnt_off0000321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321A 22752 bytes
SHA-256: 631f2ffbfc321ef7f6be72d1817ce8bf36defacb1bde344387ccbe70006ee2a9
font_01_sfnt_off000064b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B4 18656 bytes
SHA-256: fb679c9250522cab0344be15c9898f12ed930a7de6dfe2591d59bad5f2ca43f7

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