Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b7597ac37855c2…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 13:18:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 686e863b356019faa033956c0ad59d02 SHA-1: d1b5543a807e02da4203ad50ba0bef3a3379bffd SHA-256: 57b7597ac37855c2feabe3d5e2c063fe6ff2fe42242a74ca09b2e8785184f50c
142 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. 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 0.9971

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.xyz/app/406889139/free-spins-coin-master-haktuts-game-hack PDF link annotation
    • http://kontaktadig.se/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/hack-client_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-spin-160-pro_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_003_off00004a3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3D 24936 bytes
SHA-256: 894428263b34d91d92e56e0e6283a1ab6e8a455f987940e8a15052baab86b374
font_01_sfnt_off00008386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8386 18196 bytes
SHA-256: fd8ee59660af8c9e4664936919e7b5321f93298eaf8e2ea805d6f2ae56b4a3b6

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