Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfca7e8b991976d…

MALICIOUS

PDF

46.8 KB Created: 2021-05-10 20:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0e04ba8e4f6b49f6576b876792aea220 SHA-1: 6bd9e13804b5b2e8dfd963975ea1cead7a66d119 SHA-256: 7cfca7e8b991976dcff284ad88a5f3768499e4ffdbc74606b9c414835779df18
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to domains associated with free game currency or cheats, suggesting a lure for users. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'ML_NYX_PDF_MALICIOUS' flags the document as likely malicious. The presence of embedded URLs and a call-to-action phrase further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack PDF link annotation
    • http://sexythings.gr/images/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://sexythings.gr/images/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://sexythings.gr/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sexythings.gr/images/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bandicam.comIn 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_off00004c1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1C 24852 bytes
SHA-256: a9bc975bc9136020478a5f09411470dba4fbc8f5ea8115a4624308f1caed2c0d
font_01_sfnt_off000085bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off000092e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E2 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec

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