Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29eeecb354eb09b…

MALICIOUS

PDF

32.9 KB Created: 2021-07-19 14:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d725275c2c0e4fdf2e2de8387a24e6b9 SHA-1: 27da0e2739d52d8c3d9da26db153a4d4062301e0 SHA-256: c29eeecb354eb09b100598593eb2aa7d4bb9db952fb9644778699dfaa4b9f11a
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors, impersonating brands like Facebook to lure users into clicking. The primary malicious link, http://netcdn.tw/app/835599320/tiktok-viewer-free-game-hack, is presented as a 'free generator / game hack' and is associated with credential phishing and potential malware delivery. No scripts were extracted, but the embedded URLs and the nature of the lures strongly indicate a phishing and redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/835599320/tiktok-viewer-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.tw/app/835599320/tiktok-viewer-free-game-hack In PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://www.sahebspices.com/uploaded_files/userfiles/files/free-robux-without-verification-2021_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_off00002db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB4 22500 bytes
SHA-256: 2dd32dfca0925e9702e1081cc6a34f18813ed1b911a3efa8a09f743b6e0d9e23
font_01_sfnt_off00006017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6017 17752 bytes
SHA-256: 03cae80738042903ed7303e5923c2b1ca7393d04b72c6adefe1e53c55c9a8aab

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