Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa5a085d5130c8c…

MALICIOUS

PDF

37.8 KB Created: 2021-05-21 00:44:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f36d6d41fa1289b045652b853ab62c29 SHA-1: 4fe53bde347138953c44792b2570d068e9c851f1 SHA-256: daa5a085d5130c8cfbe2ffcea7aa9936b54c1287928016aec1930c7adc26af41
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with "free generator / game hack" promises. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates this malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's flagging suggest the document is designed to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7010

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/835599320/free-tiktok-coins-2021-game-hack PDF link annotation
    • https://www.gornjastubica.hr/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-avatar-roblox_GM431946152.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_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 24488 bytes
SHA-256: f9a16af9172bda00bfae106852a993462f928d1d10ad2607571ec8b7190620af
font_01_sfnt_off0000694a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00007347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7347 17860 bytes
SHA-256: 62157b557e0625fe7f4d28f443ac5124aa662715bc457b306d1c7ccf4ae45651

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