Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90a289be20b5a02…

MALICIOUS

PDF

44.2 KB Created: 2021-05-18 03:59:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a3ce18dea27242d7e30a348b9ea45f1 SHA-1: e48b61f6c2bb1c8890b2470cc8ef59cb75389621 SHA-256: b90a289be20b5a02c2f78774a1213e9a56e0cd7b0cf7fff16e1b0eab120f1231
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 0.9648

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/how-to-log-out-of-coin-master-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.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_off000048b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B0 25296 bytes
SHA-256: c3e7a6074c741cb13c5d4144ed772af051acea302431c46a959fa1dfc0468a99
font_01_sfnt_off00008075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8075 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8F 18140 bytes
SHA-256: 3138221b31ed8b6406c0e26913c361d842eb1c4d2714b685327af50e84741aa0

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