Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9db685ce73ebb5…

MALICIOUS

PDF

46.7 KB Created: 2021-05-13 20:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 84b21c69c51626a9e602abf64d72fe04 SHA-1: caef86e567a76608b21ee22788cb9ceb815b02c6 SHA-256: 3f9db685ce73ebb5e6d75b3a4b6bbc41c89edeb53d36b2b895097651f60a46df
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 0.8948

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-can-i-get-free-robux-game-hack PDF link annotation
    • https://meltonschool.org/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/rewards-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-free-spins-and-coins-in-coin-master_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
font_00_sfnt_off0000475e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x475E 29940 bytes
SHA-256: 88567730c795b9b79a00d0e5fd8c901206593984aa926885559ca37ce385c1f2
font_01_sfnt_off000089b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B2 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off0000936e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x936E 18512 bytes
SHA-256: 69cba7171cc96811b03769255314e8880e2b1f1f28661a6eda79c3c7ec8a929e

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