Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b34b5425829e02…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 15:14:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0e6dc73c21f79b7bc0d5fc17cdf390d0 SHA-1: 41322dffcd4c8ee1fecd1aace7894bbb1b0e7f0b SHA-256: d9b34b5425829e02baf19386ab6148e2e5d52f7caca347db3a91f720ec47d584
182 Risk Score

Malware Insights

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

This PDF document contains numerous links to external sites, many of which are designed as link farms for game-related cheats and currency. The primary lure appears to be 'Robux' for Roblox, with a specific link to 'robux-no-verification-game-hack' on netcdn.tw, which also impersonates Amazon. This suggests a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.tw/app/431946152/robux-no-verification-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 http://netcdn.tw/app/431946152/robux-no-verification-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-robloxian-high-school-free-coins_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-building-games-free_GM431946152.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/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/broken-bones-iv-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/abstract-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-on-amazon-fire-tablet_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/swat-for-free-on-jail-break-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-no-human-verification-android_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-doing-anything_GM431946152.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
font_00_sfnt_off00002ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDD 22368 bytes
SHA-256: 864cd3a8dcae46786c138eb993d57feb022890b0a40e754f3cf7ea9051ea4b0a
font_01_sfnt_off00006008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 18912 bytes
SHA-256: 5371eeb4f32645909a106e2314d3e19630680129b8a7356391e2a50deb7f8a6b

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