Malicious PDF — malware analysis report

Static analysis result for SHA-256 86421933d6850d02…

MALICIOUS

PDF

37.0 KB Created: 2021-05-23 10:38:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 75ce40671e6e996099df5e12894ea620 SHA-1: ec4b1852a9a5c599036a5a3309050e2602ff242b SHA-256: 86421933d6850d02ee79abdeae0fbb5dfbf87a5a30b42f8dd61f901afc488822
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a 'Coin Master Free Coins Game Hack'. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-free-coins-game-hack, is the primary indicator of this social engineering lure. The document body, though partially truncated and obfuscated, contains text related to 'Coin Master Free Coins' and a call to action, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/406889139/coin-master-free-coins-game-hack In 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_off00002e3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E3B 25824 bytes
SHA-256: 488b1f43794e0a2f4fb340c750f215e8aeb6833e2cc364f80b431dc0f97eb4be
font_01_sfnt_off00006783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00007125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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