Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f5d743ff2e0172…

MALICIOUS

PDF

41.5 KB Created: 2021-05-15 13:41:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49ef25963e2f00f42c261630ca951cc5 SHA-1: 1a1d7794c025c025e896ade38c9e4ed13d2f150e SHA-256: 29f5d743ff2e0172dc1e0b9219408f691ee2e0b316984f7e4fd0d17c7a70bee4
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/robux-withdraw-game-hack.
  • 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/robux-withdraw-game-hack PDF link annotation
    • http://aimp-market.ru/images/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-websites-that-actually-work-2021_GM431946152.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
font_00_sfnt_off00004811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4811 23668 bytes
SHA-256: 841db540c2bed5cc748b3593f4e63790094e57bb84e362378c99abbcd051251c
font_01_sfnt_off00007d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8D 19004 bytes
SHA-256: afbca514ad09227755e431614afc8addacc3d3b35e400dc0197c8deef3f460d7

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