Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2c85b175fccd88…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 08:06:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d43d0711f39a290463dc1dd8e75738cd SHA-1: 12227a7d6494ab5d15b035cf5a0be1850876d327 SHA-256: af2c85b175fccd88627a28b5bfaa0f972d9d74091bd06e0ca6f68df62241c615
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 0.9507

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/431946152/roblox-free-roblox-game-hack PDF link annotation
    • https://yowchang.com/image/data/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-link-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-game-hacks_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_off00004a4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4C 25940 bytes
SHA-256: 12662701f8077504c2e9ce394eb68796248ab532fb61a61910e22971b8a85633
font_01_sfnt_off000084fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 3112 bytes
SHA-256: 471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80
font_02_sfnt_off00008fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB6 17948 bytes
SHA-256: 33938510eb20d060112d7682b9c88b880e5c2c8c33e748f0e85f3cc6be6c07ce

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