Malicious PDF — malware analysis report

Static analysis result for SHA-256 28be31452dfe5c82…

MALICIOUS

PDF

43.9 KB Created: 2021-05-16 22:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c6bbde74e90049a12db9784dcbfc3017 SHA-1: 08ecc209b66245cdf28fb72db4a3b20df39aa36c SHA-256: 28be31452dfe5c82196ab830a1ada4f04cffbe666b06fb0be4592c9c2967d00f
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1555.003 Credentials from Password Stores

This PDF document contains multiple links to malicious redirectors, masquerading as 'free generator' or 'game hack' sites, and impersonates the Facebook brand to lure users into credential phishing. The document body and embedded links suggest a scam aimed at distributing malware or harvesting credentials under the guise of game-related cheats. The presence of multiple malicious links and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/free-robux-accounts-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 https://netcdn.xyz/app/431946152/free-robux-accounts-2021-game-hack In PDF document text
    • http://kcpb51.ru/images/roblox-top_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • http://kcpb51.ru/images/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/coin-master-daily-free-spins-link-haktuts_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_off00004cdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CDC 26128 bytes
SHA-256: ea8981a84c0d014b3d181ad72c4c081f6474308d6edaf93f5cfd2412e2885697
font_01_sfnt_off000088a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A3 18520 bytes
SHA-256: 56624e41a965b33e02442574776651ebbc56d14fd3e4bfe95c3ae0db26e97c49

Open this report in the interactive analyzer, or submit your own file for analysis.