Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c404e46ffa2e5dc…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 11:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6c654e0ddfc2d401a517a605c7601200 SHA-1: e0c1de9d964c5a2e640e02bcc8d532bd4b24dbd9 SHA-256: 9c404e46ffa2e5dc0af3a085fa88f2b822f951377da9a24458068038bae5e23b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for game hacks and free spins, directing users to a malicious redirector. The presence of a fake CAPTCHA prompt suggests an attempt to trick users into executing further actions or commands. While no scripts were explicitly extracted, the nature of the lure and the redirector implies a potential for second-stage payload delivery, likely via embedded JavaScript or exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coin-master-free-spins-link-2021-no-verification-deutsch-game-hack In PDF document text
    • https://topkoreamart.com/public/upload/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/games-on-roblox-that-give-you-free-robux_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_003_off00004a7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7B 25536 bytes
SHA-256: 73a746badbb7221323aa62186e2f762e664396df3ad50671be609eab2dfa4544
font_01_sfnt_off000084ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED4 19064 bytes
SHA-256: 1786c1695e1cfe03ab2cb4a6ae0d95f6e6e4e0c2ddd0e15a85c5675e34076ae6

Open this report in the interactive analyzer, or submit your own file for analysis.