Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4da40765c25eecb…

MALICIOUS

PDF

38.9 KB Created: 2021-05-20 15:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 224fa2b15909ddf85bd73cf8f5a311c2 SHA-1: 7160ba93ce15341bfa71bd09e425c56e59024f97 SHA-256: b4da40765c25eecb4f061b05855b7fd5261f020a0181dc21760c688bd30d2ff4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/free-robux-with-no-verification-game-hack PDF link annotation
    • http://www.homesweethome.pl/images/collect-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/minecraft-hacked-client-download_GM479516143.pdfIn 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_002_off00003076.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3076 25260 bytes
SHA-256: 3dcb881c1aa74cbbb3a0ae5e364af7942cb940c27c274e7e4835d5211b082283
font_01_sfnt_off00006aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000745b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 18964 bytes
SHA-256: 882e97bebd076dae688415b0184bb224dca7d5b64082a0b27c077a0c76cfc979

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