Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06f8f06563c7a23…

MALICIOUS

PDF

50.1 KB Created: 2021-06-11 03:28:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c61e74879767bad5fed45886f3af8a1 SHA-1: 833ec925d79272e8180eb814d208fee62e8cbf1d SHA-256: e06f8f06563c7a23c29d059fb431af9f9aefb0ee4611df5cbbaab3af76dfa6fe
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 0.9789

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.tw/app/431946152/xcuteur-bandit-pour-scrpit-hack-roblox-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-sad-cheating-story-albert-he-cried-on-video_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-wheel_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_004_off0000517b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517B 26632 bytes
SHA-256: e37775dc4517a1d39cf1c9de91d15e1cd697cab0a0656ff3f1592b830c174c6e
font_01_sfnt_off00008ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE3 4660 bytes
SHA-256: b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816
font_02_sfnt_off00009ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF3 19052 bytes
SHA-256: 4d8969b555ced525ffe03c4df66f345d792f24fb42260d2881b849404e68351f

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