Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1c3b2b49c30031…

MALICIOUS

PDF

36.0 KB Created: 2021-05-14 02:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8a4117bb91c7bcb6f7c753774b68260c SHA-1: c7c20ce3dd37fbf05cc4d10d8361f903a025b1d8 SHA-256: 3f1c3b2b49c30031947e3e43ca7a8fb1256ef18b795caf2a200fee42584bd4b0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector URL, which is associated with malicious activity. The document body and embedded link text suggest a lure for a 'game hack generator', aiming to trick users into clicking the malicious link. The link ultimately leads to another PDF, indicating a multi-stage redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0337

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-tricks-game-hack In PDF document text
    • https://pasamatour.com/ckfinder/userfiles/files/claim-robux_GM431946152.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_003_off000034b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34B3 24912 bytes
SHA-256: 1e856b75b2fcbacf8c024566a4797712d4a9f234f755cc4d026e9537a96c4b3d
font_01_sfnt_off00006ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 17716 bytes
SHA-256: 72c9dca3f555d15cf680f05a17c83eea5c84cf549c22ff1a640312a233055f15

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