Malicious PDF — malware analysis report

Static analysis result for SHA-256 3000ac2135cb0644…

MALICIOUS

PDF

42.5 KB Created: 2021-05-18 02:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a199e0ffeb9650f6880fdb2f03c87db2 SHA-1: 80eeb37b959e4e6d938ed14f8896b988b04ec71c SHA-256: 3000ac2135cb0644d88b3aa7ffebe7e9194521ee59d73d5baf442551279c2a23
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/431946152/free-robux-generator-no-survey-game-hack PDF link annotation
    • https://yowchang.com/image/data/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/114-4-hacks_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-hack-and-get-free-robux_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_off000048df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DF 25140 bytes
SHA-256: 9f437f89b68cb6cb7d2a27409619d89b37c9746d1618b2aab844357bbe390000
font_01_sfnt_off0000825c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825C 18640 bytes
SHA-256: ad191ebdc752795a68e543012f45afbe5bb028a9d541ff585eccff59a545038c

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