Malicious PDF — malware analysis report

Static analysis result for SHA-256 058c52731ea93db5…

MALICIOUS

PDF

46.6 KB Created: 2021-05-10 20:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f712efd0f1e61e6b8def024821dd2af9 SHA-1: 36cfa6229feb41530e671e39616774c669e5c457 SHA-256: 058c52731ea93db57c0947d964ea008598a1714c8aca04d6f88c99b3afaa9fda
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and scam-related content, specifically targeting users interested in game hacks and virtual currency like Robux. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were explicitly extracted, the document body and embedded URLs strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/robux-scam-game-hack In PDF document text
    • http://cristalysoptic.com/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/earn-roblox_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-hacks-2021_GM406889139.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
font_00_sfnt_off000047c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47C8 27720 bytes
SHA-256: 27bff512f929b4a7c2f8586acbc3a8e0cf780ea556e00c9a86cfe58b0e2a07e2
font_01_sfnt_off00008662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8662 3956 bytes
SHA-256: ee579ec20fccd10ff7a243885b033c09b71badc0ba3cd67f0e51600df08740f2
font_02_sfnt_off0000935d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x935D 18340 bytes
SHA-256: 383b1d6f347944e20328288fe5cf1d6e6525012059e3a3c68a0557f2d1f0cd2f

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