Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d164d732d205915…

MALICIOUS

PDF

35.5 KB Created: 2021-06-28 12:38:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0f44fdfb78459f8ac7055908e5e77c5c SHA-1: f43427dd3bd62bab77c43e1b5663152fa6d61072 SHA-256: 4d164d732d20591571e0d419f44648abfd90eb67ce8c433fa1a3e977d65cf88d
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 http://netcdn.co/app/431946152/redeem-roblox-virtual-item-free-codes-2021-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/cheat-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/como-hackear-a-alguien-de-roblox-y-tener-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/descarga-de-roblox-hackeado-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-free-game-templates_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-why-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/money-hack-restaurant-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-advertise-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-card-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-you-hack-on-roblox-assassin-2021_GM431946152.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
font_00_sfnt_off00002ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF4 22660 bytes
SHA-256: 78dba4068a931755de24d6a97a9817ed8f9fb151cd30580d4fc81324237e4b91
font_01_sfnt_off000062c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C0 19984 bytes
SHA-256: d4fba6df6280cea5c76d13c6cfdf24684809bf628f594679ce5f674c285392d2

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