Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8cae961b5c214…

MALICIOUS

PDF

36.2 KB Created: 2021-05-17 11:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc8e81fe7724d6c7af50ffa6084d4c6e SHA-1: 5144b8674929163b9f15d802d089480712ab7352 SHA-256: b2a8cae961b5c214cb98537e1720b17c50e84ccfaf0c6ff46db8917823a1285e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a malicious redirector lure, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/406889139/free-spins-coin-master-hack-2021-game-hack, is flagged as malicious. The document body also contains this URL and a call-to-action phrase, reinforcing the lure. No scripts were extracted, but the primary attack pattern is social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0303

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/free-spins-coin-master-hack-2021-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_off000032d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D9 24720 bytes
SHA-256: 16f3ac6f59618e36d51dc210d8fb8778695e6ad6f42be10f73c8f5555e3f1683
font_01_sfnt_off00006bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCA 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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