Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ed2cd745c7ddc…

MALICIOUS

PDF

35.9 KB Created: 2021-05-24 01:08:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df5d5c73ef25803c6821bc0f61738418 SHA-1: 052b6498818c909aa75b599fd082ff9ef71113b0 SHA-256: 438ed2cd745c7ddc83eeef963817a4781c05b8b7aa7a8d7354547567a0a6f87a
160 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, masquerading as game hacks and generators, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-free-trial-game-hack In PDF document text
    • https://leechan.cn/Public/upload/editorfiles/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://leechan.cn/Public/upload/editorfiles/minecraft-free-download-pc_GM479516143.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_off00003436.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3436 24720 bytes
SHA-256: fb326460a92f4e1ca24b7467d0acc66b7360fa1af99cf566f936c2f03defb771
font_01_sfnt_off00006d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D21 17644 bytes
SHA-256: eaa999d9fcd0e41c3411a6787ff304b3b9a642a81f97c4ae06503d53e3265cce

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