Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3a61c2c0101d35…

MALICIOUS

PDF

48.7 KB Created: 2021-05-11 02:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5753464780770fdc3bcbd69273657a2e SHA-1: 7304beff13bc943b786e6f4458d180fc74f13ec7 SHA-256: aa3a61c2c0101d3569970d017cba5fb467e1a1ad65971f65b1cd5b260cac02b7
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 0.9228

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-hack-roblox-jailbreak-game-hack PDF link annotation
    • https://www.prodex-holz.cz/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/optifine-pe_GM479516143.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/getrobux-now_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/coin-master-hack-https-coinms-net_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_off00004abe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABE 30888 bytes
SHA-256: 6598297cf56f14edda53b8660b1d83b9329125e9e8f6832a673b8eb67cf846cf
font_01_sfnt_off00009153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9153 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B01 18632 bytes
SHA-256: f85879c678901057cc908d94130b71f9fb6e8ee5be1c9db29d303049c5d159a2

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