Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fcf23779f06bf1…

MALICIOUS

PDF

35.2 KB Created: 2021-05-23 17:11:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 331dc35ad4da95a443738bc4f2e4ca3d SHA-1: 4ba9fedd72258c23fa920051678674917a86fde6 SHA-256: c4fcf23779f06bf17e691313ab0af077f8a12d35f754484595b5b8761ad13e9c
160 Risk Score

Malware Insights

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

The PDF document contains a lure for free game hacks and TikTok followers, directing users to a malicious URL. The ML classifier and specific heuristics confirm the malicious nature of the embedded link, which points to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a malicious payload or redirect to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 4

  • 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.
  • 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/tiktok-followers-for-free-game-hack In PDF document text
    • http://islamkennis.com/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://islamkennis.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://islamkennis.com/images/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://islamkennis.com/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://islamkennis.com/images/free-roblox-hair-codes_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_off00002f99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F99 25636 bytes
SHA-256: 0f32720a9038936a316c02db2eca4e49ab3ff6b5587fa9000264f9e757efb1a7
font_01_sfnt_off000069cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 17692 bytes
SHA-256: 1b1e1c30a9592b0fb91196253d93c27419259905b41c1e14a3654a7d7056ebb4

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