Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bed4a1a3583423…

MALICIOUS

PDF

39.1 KB Created: 2021-05-12 19:30:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 95d85f74074af25ce36921cf4a51ef38 SHA-1: 885217755519e77c484d2a5b08687c3b03a95073 SHA-256: d1bed4a1a358342383b597704825af9294b0551cc6f2ea3c1061a5384750ca62
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Coin Master Free Spins' and embeds a link to a known malicious redirector. This suggests the document is designed to entice users to click the link, likely leading to further malicious content or downloads. The presence of embedded URLs and the specific lure indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-spins-link-download-hack-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_003_off000034b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34B7 24444 bytes
SHA-256: e7b09077aa9d6e954d80f901e586031892c613846ee1a90e20ec0a8a3be21d8c
font_01_sfnt_off00006c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 18636 bytes
SHA-256: c1ec4201564ac412151aee87dd7e29d753873e3095a9b57a5834a311c08c0525

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