Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ddecac314caf75…

MALICIOUS

PDF

34.7 KB Created: 2021-05-21 13:23:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b737040cea845d204fda509c47ae2c16 SHA-1: 32471d44171afa04a885d3960e03de04bdaa783d SHA-256: e5ddecac314caf754681d8fba238add140c4b8764149d24602891d523663c0bb
200 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, specifically a 'free generator / game hack' lure and a call to install a browser extension, to entice users. It contains multiple links to malicious redirector infrastructure, including the primary URL 'https://netcdn.xyz/app/835599320/free-likes-on-tiktok-no-verification-game-hack'. The document's structure and embedded links suggest an attempt to deliver a second-stage payload or redirect users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-likes-on-tiktok-no-verification-game-hack In PDF document text
    • http://cdescolapios.org/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://cdescolapios.org/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/robux-no-human-verification_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_002_off0000316a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316A 23716 bytes
SHA-256: 34878b182d17d45b4b16510a66934579025f78f31a73b904242186e017d85b0d
font_01_sfnt_off0000675e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675E 17816 bytes
SHA-256: 589fcfe1de1caf68ef089dfb8e48f20b64e47950833209f6cee198fde2e4bcf6

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