Malicious PDF — malware analysis report

Static analysis result for SHA-256 9861796926942d73…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 17:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a297e2435259c5f9f1bb08cdbb6bc255 SHA-1: 8dc333935980bace50848246a95d238ed6ea6775 SHA-256: 9861796926942d7304c5629989f7fd0035db34fbe9ea08494e3337975f36019e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a primary redirector at 'https://netcdn.xyz/app/406889139/daily-free-spin-and-coin-game-hack' and a large number of PDF link farm entries hosted on 'bepquannhu.vn'. These links are designed to lure users into clicking on potentially malicious content related to game hacks and free currency. The document body and embedded links suggest a social engineering tactic to drive traffic to these sites.

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.
  • 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.xyz/app/406889139/daily-free-spin-and-coin-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/my-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-accounts-2021_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_off00004942.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4942 25568 bytes
SHA-256: 8f8370288932e2b79101700907bb25986d566d997acca2e562658208ee819d1c
font_01_sfnt_off00008303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8303 18380 bytes
SHA-256: 6101249768ea98132d58b7ce4bec1ba8398b7dbfa6e5834de96bb11e225e4313

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