Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c86d4fef3ca6e3…

MALICIOUS

PDF

40.9 KB Created: 2021-05-14 06:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 08cfa2951a4bacda6ae18936a5a19e67 SHA-1: 8cf137e9619decee126252f9ceacdf45986fe804 SHA-256: 90c86d4fef3ca6e3b84e279db0f9a757dc2aae967f41f377557b432892270f3d
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Coin Master Hack" and a malicious redirector link. The embedded URL points to known malicious infrastructure, suggesting an attempt to download a second-stage payload or lead the user to a phishing site. No scripts were extracted, but the PDF structure and heuristics indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-hack-2021-apk-download-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_off000037aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37AA 25924 bytes
SHA-256: 9d4eb93566e065117567c06d3cce5bd8167adc0b696d5c47a212f0d390ac0274
font_01_sfnt_off00007297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7297 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 18876 bytes
SHA-256: d7d40464d831938cfa9caec420339d0a09463e275fb7b32e55518fa26c88094b

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