Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cb37ce6d45e7bb…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 13:18:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3baa546ba505ce2fb0e2318780af4220 SHA-1: bd980c698eab163dfc47f9c77359dfeb4d6efc52 SHA-256: c1cb37ce6d45e7bb4d613a483b576ccb2b04891e3d67b975c79be2bc991e4bd6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

This PDF document employs a lure related to game hacks and free Robux, directing users to a malicious redirector. The redirector impersonates Facebook to phish for credentials, indicating a credential phishing attack. The presence of embedded URLs and the nature of the lure strongly suggest a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/how-to-get-free-robux-on-laptop-easy-2021-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
  • 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/how-to-get-free-robux-on-laptop-easy-2021-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/rbxdemon_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/now-roblox-logo-gives-free-robux-robuxmaniac_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-accounts-2021-december_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-generator_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/descargar-hack-para-roblox_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-jailbreak-hack-script-download_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-free-guest-play_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/buy-robux-free_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_off000030ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AC 22900 bytes
SHA-256: d047836feafbda0da494c08a782ae6263b7dde5ca0f200be3ec37f30d4633a13
font_01_sfnt_off00006402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 19740 bytes
SHA-256: d2d324012b6706c69614ce7aa18a98545d3586092bbeda31233ed17ef3a88b2e

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