Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac753fd72e8e40cc…

MALICIOUS

PDF

45.3 KB Created: 2021-05-16 21:16:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4c18c7cc66a93a07c2ee941f1011d529 SHA-1: 64fe30efd5cb82c5c5ce33da22fc1bf060010e7e SHA-256: ac753fd72e8e40cc57d004d6b1242e24c3402ddfb496a217b86842f55e0cbd7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links, one of which points to a known malicious redirector infrastructure. The document body and heuristics suggest a lure related to game hacks and free currency, designed to entice users to click the malicious link. The primary malicious link identified is https://netcdn.xyz/app/406889139/unlimited-coin-master-free-spins-game-hack, which is likely used to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/unlimited-coin-master-free-spins-game-hack In PDF document text
    • https://www.appartamenticroazia24.com/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/i-robux_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/robux-online_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/minecraft_GM479516143.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/village-coin_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-spins-on-coin-master_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
stream_003_off00004b04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B04 23852 bytes
SHA-256: 6c74275a3737085acf7eb772903a0d7b65fc465f0de2c3ef23a3723b69aa55b6
font_01_sfnt_off0000812b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812B 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00008db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB1 18580 bytes
SHA-256: 8174e31e86101b13b9901149211171076a60a6b50e3f7464e0ceab7d787638aa

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