Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b9dfd3700798f9…

MALICIOUS

PDF

45.1 KB Created: 2021-05-19 06:09:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a718cf540fc4e0c697a99a8741abd767 SHA-1: 62611692b4d4a4c9554a6c4637a0c74f79c5b02f SHA-256: 31b9dfd3700798f98d0b93f1378d944dc00dc296e0da3fa751649e49a2a921aa
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a known malicious redirector at 'https://netcdn.xyz/app/406889139/coin-master-free-download-game-hack'. It also links to an IP address 'http://217.165.206.12', which hosts a large number of PDF files related to game hacks and free currency. This indicates a lure to download potentially malicious content or visit further compromised sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 6

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/coin-master-free-download-game-hack In PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-spins-link-2021-download_GM406889139.pdfPDF link annotation
    • http://217.165.206.12/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://217.165.206.12/userfiles/files/free-spins-on-coin-master-2021-ios_GM406889139.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_003_off00004a9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9E 24480 bytes
SHA-256: 2bc3b695d9093f4975697e73025abe10dc0b86f95d1b2a342b44bf508aeda598
font_01_sfnt_off000082e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E0 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBF 18292 bytes
SHA-256: 1420c55b4555a3c93edfa38397747ee720807b137973850ab9437a8daa1aea65

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