Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e2d4cbb5fd8fb8…

MALICIOUS

PDF

33.4 KB Created: 2021-06-25 14:03:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ae5af79445c2409bf133772809d82ef SHA-1: b211f280edf7d114d37ba1e0c468f462c7f01cbb SHA-256: 42e2d4cbb5fd8fb8de6fe2e9bd22b4fe8d7825040afe2590dac39fa872e6646c
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/free-robux-stuff-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/best-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-unlimited-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-aimbot-dll-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-free-items-games_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-hack-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-robux-free-easy_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/pokemon-go-free-3-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-use-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/blogspot-free-spins-coin-master_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
font_00_sfnt_off00002c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6F 22300 bytes
SHA-256: e7725a2935f1083a7c9e652b085af303829bcd2f8660f415ae622a1fb3fee381
font_01_sfnt_off00005df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF9 18820 bytes
SHA-256: 8a2e5c5d213d9903dc965c8e85bf2417418bc26616940a7c3b13fb9b1a67c932

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