Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db56aa28e8ea3bd…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 23:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a9b614ec59ea64939c35d3dbd3f4424 SHA-1: 56e30cf20a41fbfd75996cc94ba500deb7edfe31 SHA-256: 1db56aa28e8ea3bd23ace152c7f126bff1c81905efd7dd2a9e2e5887da1f7e79
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 a fake-CAPTCHA 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 0.9969

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/how-to-get-free-robux-without-doing-anything-game-hack PDF link annotation
    • https://koeltotaal.com/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-card-collection-hack_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_off00004ac4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC4 25256 bytes
SHA-256: 050e8ba8cc353d128b7dbf222d7b05c92b3c9fd8e58d8a5a16ce1ace46e335a4
font_01_sfnt_off00008499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8499 19400 bytes
SHA-256: 843e7c6de0628ecb74dfde19cdfb212261a67f0d6d996bc16e2547f6c0bce3d3

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