Malicious PDF — malware analysis report

Static analysis result for SHA-256 9372cbb9b8a5b550…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 22:23:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 572df6b416f150965919c0cc8db73090 SHA-1: 08480f34dd45702b1f283d702654959be7bfd177 SHA-256: 9372cbb9b8a5b5507af323d35248927f778a7029fdc46eaff4cfdf3e0ba77729
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-coin-master-spins-2021-link-game-hack. The document body and heuristics indicate a lure related to game hacks and free currency, suggesting a social engineering tactic to drive users to malicious sites. The presence of many external PDF links also points to a link farm or SEO manipulation for malicious purposes.

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/free-coin-master-spins-2021-link-game-hack In PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-do-you-make-your-own-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-free-bloxbux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/gui-template-roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/hack-roblox-ac_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-robux-get_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/roblox-xeber-hack_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-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_002_off000030be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BE 23504 bytes
SHA-256: 9412e38affe296487143c580184662764f5bf38688d4293dd19a01614d2d585c
font_01_sfnt_off00006605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 18748 bytes
SHA-256: dec767a01a5148b82a1b5c64fba60f566381c9379fb4ae5fa125452327237769

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