Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4579482c4c9a934…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 01:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cb02328c2151d265e8421e40a63bf71d SHA-1: dbbf38cb2a994aef5faa8ce3295b51912bbe0ff9 SHA-256: e4579482c4c9a9343b94e21a42a34a7d8e3f5d322fbb6fc4bd0a61b043fbef7c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for free game items, suggesting a phishing or scamming attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent.

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/free-spins-coin-master-november-2021-game-hack In PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_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_off00004a78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A78 26024 bytes
SHA-256: 0bb2b1654063c11a9d33fb013bef16412036da3a6c9700dbcfc2a4bfbd058da0
font_01_sfnt_off0000843c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843C 18820 bytes
SHA-256: 51030d0b126b89f1cc2c8ab05e6528d79dc2725cd6845144c535f360e3c6c899

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