Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e515caacc112c66…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 22:20:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b8baa6064724bdab6083484f49051126 SHA-1: 27813d896f20bb2f847c4e6909bc2ca563bcd7ff SHA-256: 9e515caacc112c666761e22e061d81023c2a58570a11d7dc194edd7be3a858c9
182 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links, specifically targeting those seeking game-related cheats or accounts. The document contains a large number of external links, many of which point to game hack generators, indicating a link farm or phishing attempt. The primary lure appears to be related to 'free Roblox accounts' and 'Robux'.

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-roblox-accounts-2021-with-robux-game-hack PDF link annotation
    • https://cluster-consulting.com/images/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/robux-gratis_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/robux-survey_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coun-master_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/rewardex-robux_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-key-free-spin_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_off00004aa4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA4 24152 bytes
SHA-256: cf6f3ac12fc4e46c59b4321e804e5e6f49cffd9de819a2b526a17586bd7d0788
font_01_sfnt_off000081d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D7 19076 bytes
SHA-256: a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618

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