Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a4f8f9e3662320…

MALICIOUS

PDF

39.3 KB Created: 2021-05-21 17:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e9412038c1e2960a8d9974c4024fcf43 SHA-1: dd3cac77ba40c01dc417aac8945865c9828b36af SHA-256: c9a4f8f9e3662320eb0c422334929bc18e431c55d49539b25ca19cd34fb2f75a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as 'game hacks' or 'free generators'. The document body and embedded artifacts suggest a lure for free Robux or similar in-game currency. The presence of multiple redirector links indicates a strong intent to lead the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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/431946152/rbxoffer-com-free-robux-game-hack In PDF document text
    • http://kontaktadig.se/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-minecraft-for-free-on-ipad_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_off00003500.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3500 24932 bytes
SHA-256: 663235c201cb900f7b924aaa7ec9b537257375b71a67a440537d9193338c72ed
font_01_sfnt_off00006e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E80 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000782e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782E 18276 bytes
SHA-256: 9aeb6f41d3354634239b7c8beac9b422ae3978a513a1679011b82127add4d155

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