Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7acf1df6a03892…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 16:50:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab1253a1c54df507b4e59541888651c4 SHA-1: 5d9dc5908b82cf0e9c5626d6ca6eb4c35fe9ce6d SHA-256: eb7acf1df6a0389206854f809f3248fc0989940e5d670cdffcc2c30ac98dbc92
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/479516143/minecraft-free-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-script-tampermonkey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-free-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/money-hack-sur-sunset-city-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-money_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/can-free-models-make-your-game-lag-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-easily-promoted-on-roblox-groups-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/escape-school-obby-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3293 23160 bytes
SHA-256: 56768c1e9195e85a74bffb3dee92cec45b785b62e7231f3ec2f7efe513b738ea
font_01_sfnt_off0000664f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664F 17856 bytes
SHA-256: cc1e3add4a04a98446b1b55314af2162444863ccaf169a3449495116b9daf471

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