Malicious PDF — malware analysis report

Static analysis result for SHA-256 472f90fccdfc94a7…

MALICIOUS

PDF

35.8 KB Created: 2021-07-19 09:41:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a58511e9c68926caaf50382afc7842ea SHA-1: 4c2298e838c5d1724d2b77dff6dd52fc621dc9d0 SHA-256: 472f90fccdfc94a7748044475f676ee454bedac4d43ddeaa88dc67da8e8b8cbe
160 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which links to known malicious redirector infrastructure. The document body also contains a call-to-action phrase, reinforcing the deceptive nature of the lure. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7230

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 http://netcdn.tw/app/406889139/free-spin-link-for-coin-master-game-game-hack In PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002b8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B8C 23188 bytes
SHA-256: 32fa7b80d62104a9836e3a8bbd9beca39f7f1b582bbdccb9888757d1df8e71ea
font_01_sfnt_off00005ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000069db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69DB 18316 bytes
SHA-256: 4ad106dc66915d7a7c54c506e35e2e74cb7406920644c521a55874c4c44ea7c2

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