Malicious PDF — malware analysis report

Static analysis result for SHA-256 2151a1f28810c478…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 03:53:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c93bad1e85ee3b6ef2bf4f0e6a7df64d SHA-1: a91e1e1d7ec9fc3e5379231aad6807a82618024c SHA-256: 2151a1f28810c478fb1ea4d3b21aeb6969dd5db3e32f5bdbbb6f068539972a3b
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 0.9980

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/how-to-get-roblox-money-game-hack PDF link annotation
    • http://ferienwohnung-dorsten.com/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/games-for-robux_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-dorsten.com/images/get-free-spins-coin-master_GM406889139.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_off00004b56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B56 29724 bytes
SHA-256: 6a3b14b8f5be6cbb254ae7f8b3ed41972e0ccce24a0910bd8561353f1cbd2a50
font_01_sfnt_off00008f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F26 18428 bytes
SHA-256: c447f334fad9b15f432f5aac5fa8081b18071b5b9f1330fc1e6c33f3b8eba776

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