Malicious PDF — malware analysis report

Static analysis result for SHA-256 357087262cb391bd…

MALICIOUS

PDF

35.8 KB Created: 2021-05-16 00:01:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6714bacfd8addaa4c801a98bfb67009d SHA-1: 43764722bce92d763b10f389ae67488b5e2f7e38 SHA-256: 357087262cb391bd0a414219afc975b59ef12747fd77e738a012419607b433ad
130 Risk Score

Malware Insights

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

The PDF file contains multiple links that redirect to malicious infrastructure, specifically a 'game hack' lure. The document body and embedded artifacts suggest an attempt to trick the user into visiting a malicious URL, likely for further exploitation or malware delivery. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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-claim-spins-game-hack In 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_003_off0000333e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x333E 24692 bytes
SHA-256: 766667cf40fecc58887675742a3253940629fa9dd51c298c8963f6b1441238a7
font_01_sfnt_off00006b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4B 18056 bytes
SHA-256: 910bba4e9b8698471f084902004854848b7ccdb185fd175879c14395f4b2f674

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