Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c5f8e43e96abe…

MALICIOUS

PDF

38.1 KB Created: 2021-05-22 00:45:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e39f68c47bb991a1b9ffb724e08c39e9 SHA-1: 8d8bc84fcb7ff2df59fed3dabf7fa759ca2ff900 SHA-256: c17c5f8e43e96abe5639df5d014305fe93e73a558d77b289e469bb1a1254138f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' to lure victims. The primary malicious URL identified is https://netcdn.xyz/app/835599320/free-tiktok-followers-app-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

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/free-tiktok-followers-app-game-hack In PDF document text
    • http://nep-operationalmanual.com/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/to-get-free-robux_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_off00002f74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F74 25824 bytes
SHA-256: 2f1099aefa5d82af41ce70c0fa4168101f2efd46d287dfb7866510a23e67d37c
font_01_sfnt_off00006a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A49 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00007474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7474 17872 bytes
SHA-256: 34129f1c56e014fb2604607ed740d581eed4f4cd55f156cb19b3173e06165e4c

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