Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acff58ee7deb98c…

MALICIOUS

PDF

35.9 KB Created: 2021-05-23 13:14:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 37ca1997ec7017570efd446ec8f27a34 SHA-1: 5c8c11cc2da745bb1b6cdcf5da7f5a091671ad56 SHA-256: 3acff58ee7deb98cbc4e6e785700b10168d3f32a306b1b58e0ddd5ec49bbdb81
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded links and a call-to-action button, with heuristics indicating it links to known malicious redirector infrastructure. The primary lure is for "free generators" or "game hacks", a common social engineering tactic. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the document structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9758

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
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/robux-sites_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-hack-link_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_002_off0000321b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x321B 25856 bytes
SHA-256: 7eff65485301139de12c37e3ee3191d52be01342d02ad8001a54ba38d96f1184
font_01_sfnt_off00006cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 17692 bytes
SHA-256: 1b1e1c30a9592b0fb91196253d93c27419259905b41c1e14a3654a7d7056ebb4

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