Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea50e98180d5b826…

MALICIOUS

PDF

47.0 KB Created: 2021-05-12 05:42:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5af703914d8f0952b9bb348cb27c5a64 SHA-1: a04a631f75599657e6cf616ea2bc94c03101d8b2 SHA-256: ea50e98180d5b82655311fb5523f7c12ee81c89a0662fc145a6c1b0be2e8b569
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of free Robux and game hacks, redirecting them to potentially malicious sites. The heuristic firings indicate that the document is specifically crafted to link to redirectors and SEO link farms, suggesting a primary goal of traffic generation or advertising fraud. While no scripts were explicitly extracted, the PDF structure itself facilitates these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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-websites-that-actually-work-2021-game-hack In PDF document text
    • https://yowchang.com/image/data/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-install-free_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/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (stream_003_off00004cd1.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD1 25356 bytes
SHA-256: 1b7d7e609a649c766402627802370ad0569c38c8e3fad2d72c43d22e5151b5fb
font_01_sfnt_off0000873d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873D 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000090ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90EE 19656 bytes
SHA-256: 7b3ca8e33f6ab65cae0b12a773bae5d0e0377a7b1030ef9ec14be3c3cdd71d54

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