Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f2538fabdb3e2f…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 20:44:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3603bef39d86f158b10ebd1e5b213a2e SHA-1: 11fca93b1ed6fac9b3ff7e6f532952c3392c15df SHA-256: 76f2538fabdb3e2f4638a0711480bd0c1a4a68b816f8ee0d5d174126b8641240
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 0.9969

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/431946152/roblox-games-with-free-boombox-game-hack PDF link annotation
    • http://techmobil.pl/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F4 26828 bytes
SHA-256: 69f6495552304f49d1d20dac6b90f3108e4b2c61eb937e809a0422d259108b22
font_01_sfnt_off000085cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 19024 bytes
SHA-256: f19becf6ce6933bb0ac9725c8bd55fde31cd7c8868717e467a8d53035955367c

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