Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0b00ddb5cf13f6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 06:03:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db6e5509fad0314d70ac875f44671ffe SHA-1: 74ce056628c9cc636be38763f11db97fb4cca098 SHA-256: 8c0b00ddb5cf13f692da130a8b66fc17235ed0b1814531309e7b7ea7c36330b2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a primary redirector at http://netcdn.tw/app/431946152/how-can-u-get-free-robux-game-hack, which is flagged as malicious. The document body and heuristics indicate a lure for game-related cheats and currency, likely intended to lead users to scam or malware download sites. No scripts were extracted, but the extensive link farm and malicious redirector suggest a phishing or social engineering attack.

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/431946152/how-can-u-get-free-robux-game-hack In PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-booga-booga-auto-farm-hack-afk-farm-working-2021_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/cheat-extension-google-pour-cheay-roblox_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/is-john-doe-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-generator-2021-no-download_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/changer-la-valeur-dun-nombre-sur-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-roblox-uncopylocked-games_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_off00003283.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3283 22336 bytes
SHA-256: 789e2593a5d38c4e27f81bf190829d8c804691981e722673bb77c712399dcb50
font_01_sfnt_off0000642b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642B 18984 bytes
SHA-256: 4698faf456f89a42db1aab957ed0472ea92275296e6b47032fd7fe1dc79199a2

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