Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6a13503e78f1b8…

MALICIOUS

PDF

36.1 KB Created: 2021-05-12 02:39:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cfb6c3ead9a588eb2925dd20122935f9 SHA-1: 91dac5768d2a2c3e9b3a3fac7f4125d47f56e240 SHA-256: ff6a13503e78f1b86f58005b5de784d6a6f2f3a91d22c8b6a7850da490e0587a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically a lure for a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/406889139/tiradas-coin-master-game-hack, is associated with known malicious infrastructure. The document body also contains text and links that reinforce this lure, including a call-to-action phrase. While no scripts were extracted, the primary attack vector appears to be social engineering via a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0354

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/tiradas-coin-master-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_off000033f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F4 25352 bytes
SHA-256: 56b27ee2272f37f111ccea34c7c3130f35c8f31ed8cfbf5d80d823985b31d480
font_01_sfnt_off00006d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 17720 bytes
SHA-256: 15d95e48d36938550ee5d4d1f29705b15c24be7e4b7e19dd80ff84a2db447fc5