Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9325fed177abfc…

MALICIOUS

PDF

45.2 KB Created: 2021-06-07 13:51:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9f8bb7bf2451022b74db6c35ed761b48 SHA-1: 02db8fd6c8a845f0ec790890a941d79b64b94b05 SHA-256: 8c9325fed177abfce528e4d44fad0773a2a41ac01d9dfc46b5ecc839cc6eb036
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures for game hacks and free codes, directing users to external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of linked PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the nature of the lures suggest potential for further malicious activity, such as downloading a second-stage payload or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/free-card-codes-generator-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/pubg-90-uc_GM1330123889.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-haktuts_GM406889139.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_004_off0000508d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508D 26924 bytes
SHA-256: 3ce486af78f5d3717358ec4a08737a91ae1e3ceb011574975cbf7e73274d114a
font_01_sfnt_off00008d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D72 18456 bytes
SHA-256: e76ce17935bbd0ba0772e49274380a57554e7e576581f89a686622b0e0373846

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