Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9867f0c23d1e49e…

MALICIOUS

PDF

46.4 KB Created: 2021-05-12 22:44:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f898686a65c16d5fb775cacdc36e0295 SHA-1: ab75d15f35511b093c81ef6ca42cf03d5fd7c05f SHA-256: d9867f0c23d1e49e63b17e18ce0c986d4e2ce0933b20a50fce36dcd59585a1e5
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 0.8948

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 https://netcdn.xyz/app/431946152/instant-robux-game-hack PDF link annotation
    • http://eurocomes.com/images/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://eurocomes.com/images/free-robux-generator-com-roblox-hack_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_off0000499e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499E 25888 bytes
SHA-256: 18f62b7115ef9eb2a526cf549f54d93000e53f65bac914abaf3a0267d6b9feda
font_01_sfnt_off000085d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000092e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E6 18184 bytes
SHA-256: 234f9e95fa1241feb438ae0efba81c56d05ba2863eb0b0d090bdd6eb60e49a51

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