Malicious PDF — malware analysis report

Static analysis result for SHA-256 973c82055d4bcfac…

MALICIOUS

PDF

36.7 KB Created: 2021-05-22 02:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 037d965b0ac1025fbed996ab07982fa0 SHA-1: b5167d4ce4f8e7a4ed84c64bc77348374eaa636b SHA-256: 973c82055d4bcfacdde8685cb1aa28c090dbcf22da3d1ca3952d3ce126198122
160 Risk Score

Malware Insights

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

The PDF contains multiple links to websites that host further malicious PDFs, disguised as game hacks and cheats. The primary lure is for 'free spins coins coin master' and similar scams. The ML classifier strongly indicated maliciousness, and the embedded URLs point to known malicious redirector infrastructure, suggesting a multi-stage attack designed to trick users into downloading more malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-coins-coin-master-game-hack In PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-robux-easy_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_002_off0000348f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x348F 25532 bytes
SHA-256: e37033e8ad1690ade388037013626d650f9135f3c1c1a7819b893bfccb8df1c2
font_01_sfnt_off00006f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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