Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fb40c9b29d83d0…

MALICIOUS

PDF

49.0 KB Created: 2021-05-17 15:51:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db52eccd5c2fcd10b31aeaafdec1427e SHA-1: ba001f91db55f8d6be03fd3b1bf2c30e3b3ccc82 SHA-256: b7fb40c9b29d83d08e6e8ea39124e4c1360284c9dbddee267acf0faef9e54afd
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 0.8642

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/406889139/coinmasterdailyfreespins-com-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0C 24832 bytes
SHA-256: 8e2b3aa880864b8cdebd1e65425f2be57b54510ccc4afc3fd52ed8245c534d94
font_01_sfnt_off000083ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AB 4376 bytes
SHA-256: 83b5a44be6f594423d646d9320a807ff43d7996f9c6651a747cf62c51bf2ef23
font_02_sfnt_off000092a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A0 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C90 18412 bytes
SHA-256: e2599cc8a892eefc31c10bac6f2183dab570b4c76225f1f1bdeb83a3d04eb4f4

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