Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0687f6ef842552b…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 16:47:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e715465534002d8001e324483d4aabc8 SHA-1: a99f1d08ddb84d7bd2f2049eca136bed9b02f629 SHA-256: d0687f6ef842552bce6a083f8f34b54d6e94413896f46164107b0de18aa09c7e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.tw/app/406889139/free-foxy-food-coin-master-game-hack PDF link annotation
    • http://www.eucorro.com/arquivos/files/how-to-fly-hack-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/is-roblox-free-to-play-on-pc_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-phantom-forces-all-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-us-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-roblox-hack-mad-city_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-de-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/exploit-hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-piano-the-fat-rat-monody-hack-delay_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-mining-tycoon-hack_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-roblox-hacks-2021-no-dll_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/cheats-to-get-more-money-in-adoupt-me-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-roblox-jailbreak-private-servers_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A2 22932 bytes
SHA-256: f83c91dcc9ad52a9bedca031f207d88ef72cae56df0d1a817767a9c369003ee3
font_01_sfnt_off00006720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 18564 bytes
SHA-256: af4d53c9d4850c84ea476dc8337184aeaf232e1c3d9d0e54b726c0ec8114b362

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