Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5ad515ed0f863…

MALICIOUS

PDF

42.6 KB Created: 2021-05-10 20:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 07c2b2e8e41b76cc5f0fc75cdd200fb1 SHA-1: 111011ba63751957a8b828aff65db61ca5f438ea SHA-256: 7fd5ad515ed0f8639425c8d01df04fb3b961558e5060a6ac7f39ebd41e73243d
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 0.9971

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/coin-master-free-cards-link-game-hack PDF link annotation
    • https://www.fubode.org/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/free-roblox-hack_GM431946152.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
stream_003_off00004c1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1F 25036 bytes
SHA-256: d996e86316dd2f27ab7f5f4a34d081cb9b27e21291ac3869005c539532e8cf2c
font_01_sfnt_off000084b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B3 18056 bytes
SHA-256: 4c00fba11e6222d30ce91962ad0846eff86227a46da4e4704094e367f0981575

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