Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe77565154f2a4c…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 08:12:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ccdee3f01ebc0df3764d4695e9bb3b0b SHA-1: 261acf269885ddae22611e646eefc84567fedc26 SHA-256: 2fe77565154f2a4c634e265a03a1073fb54ae22bdc77e8c012fd3e9e6f584e2d
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 0.9769

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.online/app/479516143/mc-update-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.online/app/479516143/mc-update-game-hack PDF link annotation
    • http://perpus.i2s-learning.com//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000541c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x541C 25160 bytes
SHA-256: acc3342d36ee6805ed7b46bb50b2c7eeda9b759c8e60e602b07479dff5d3a95c
font_01_sfnt_off00008de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE8 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off000097f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F6 17984 bytes
SHA-256: d912b59cf3700509e031a0d1a9fafd9fa7aacd8625d0d81f580c93ae41e1c27e

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