Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916e40d844f9c38…

MALICIOUS

PDF

44.6 KB Created: 2021-05-14 12:06:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dace31d99156549b4919682b5540f8ff SHA-1: 56eac63b6b2632eb2ac35670ce24c4bcfdfde1de SHA-256: 8916e40d844f9c380cf3b4c1b5c88f4465f5be0415228b66ebba1ecb51067e44
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 0.9632

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/479516143/free-minecraft-printables-food-labels-game-hack PDF link annotation
    • http://techmobil.pl/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

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
font_00_sfnt_off00004968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4968 24628 bytes
SHA-256: 6a04c9a862453a812b6119cc33303a56a473819bb7c87574340a9697ab3574e7
font_01_sfnt_off000081a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB5 18272 bytes
SHA-256: f2c529c176ea6290bd871c2fd1a1a72e1d93e196016b8d790adf98aeb938da6a

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