Malicious PDF — malware analysis report

Static analysis result for SHA-256 b806cedca56e1b9b…

MALICIOUS

PDF

33.7 KB Created: 2021-06-30 05:54:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 507d99a18065538d3964d5fc2792907a SHA-1: 60d496dd263eea0faaac30e049473930a17b82fd SHA-256: b806cedca56e1b9b0d5e7ce9b0d8475fed7a4e6152c92b24669b2855865a5582
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links and references to obtaining free Robux or hacks for the game Roblox, indicating a lure for potentially malicious downloads or scams. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malware. The document body itself contains embedded URLs and text related to these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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/how-to-get-free-bloxburg-roblox-game-hack PDF link annotation
    • http://elib-s2.ubl.ac.id/repository/roblox-promo-codes-coupons-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-get-free-gear-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/btools-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/image-id-for-retail-tycoon-roblox-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-roblox-goft-cards-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/new-op-roblox-assassin-aimbot-script-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-can-you-get-robux-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-do-i-hack-roblox-to-give-me-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robuxs-no-offer_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-scam-game-uncopylocked_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/farming-simulator-free-codes-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/http-www-cheatsguru-com-pc-roblox-cheats-codes_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-roblox-2021-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hack-system-for-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/play-roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hoodjews-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-bloxburg-free-gamepass_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_off00002dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DCB 22060 bytes
SHA-256: 212bb943d2056f878356d8d7f95d99350cdcc061a846777c7a6a3d4d0ef5af65
font_01_sfnt_off00005e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 19056 bytes
SHA-256: f429053328a436c1d4180ba81ea98505b665d0114838cda3e8fe2db98879eb36

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