Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf20518a752fb5c…

MALICIOUS

PDF

45.0 KB Created: 2021-05-18 06:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8e8da9fa64bb09330cac4e3120b4e3eb SHA-1: 85b1509bc5bc7c4302ba7370f2c15bb8d71c24d4 SHA-256: 8cf20518a752fb5c7fed493100d42c690289daf6603586e1ffb8f9c226cffbe2
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with embedded links. These links, such as 'https://netcdn.xyz/app/431946152/how-much-robux-can-you-get-with-1-million-dollars-game-hack', redirect to potentially malicious infrastructure. The document's content and heuristics suggest a social engineering attack aimed at driving users to scam or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/431946152/how-much-robux-can-you-get-with-1-million-dollars-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-game_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coins-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_off0000495b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495B 24052 bytes
SHA-256: ade51ce142d76c18f56e671868a068133b892466604ad311c994d9b85d5bbb38
font_01_sfnt_off00007ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF0 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000089a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A1 19536 bytes
SHA-256: 876d9410c613bd28eae874a8e258613decc08a63963b9dc9af550a443a712a6c

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