Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9110d90e5d78fb…

MALICIOUS

PDF

43.8 KB Created: 2021-06-14 00:14:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b205ef03bf630795c832ea0a87798551 SHA-1: 30d9abc33985577930f944f6c1deb90f55201df1 SHA-256: 5d9110d90e5d78fbfb8ed301659534ce3a4895c9453abf06944ee4c1037d7150
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirector infrastructure, masquerading as free game hacks and impersonating Facebook to trick users into clicking. The primary redirector URL is http://netcdn.co/app/431946152/denisdaily-skin-roblox-free-game-hack. The document also displays a fake CAPTCHA prompt, further encouraging user interaction with the malicious links. While no scripts were explicitly extracted, the nature of the lures and the ML classification suggest a high likelihood of the PDF attempting to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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
  • 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.co/app/431946152/denisdaily-skin-roblox-free-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.co/app/431946152/denisdaily-skin-roblox-free-game-hack In PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/dolphin-hacks-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/robloxcity-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/mac-hacks-roblox_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
stream_003_off00004bb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB6 25384 bytes
SHA-256: 2f8b41fe87a51dde0bb1a68513221f586640f6117e320b9abf63624fe8b3102f
font_01_sfnt_off00008697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8697 18988 bytes
SHA-256: 519d73b767de2eedf977b0eddda260b33b12068174ec0a83e0d93ce06706b71c

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