Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bca43e7d58601dd…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 03:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20245bbf834d03e21c8b00ab93209be SHA-1: dd8fabb48399ab3eb81c9e51cd5ea1c5cebc91b8 SHA-256: 3bca43e7d58601dd3efb3fffd52f476ec71cdf0438bb7d2a6480a9c2c2cfbd35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, however, directs to a malicious redirector at ttraff.ru, which is disguised as a download link for 'dungeon siege 2 broken world'. This suggests a social engineering attack aimed at tricking users into downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/wix?keyword=download+dungeon+siege+2+broken+world
    • https://static.usrfiles.com/ugd/9421c8_ac11a26973c04fc7a1d40e688555384f.pdf
    • https://static.usrfiles.com/ugd/289c5e_1ca994a272b743638680412813b92c1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_51daf907da9847f090bb1f03e0535f51.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/gumixutemelisege.pdf
    • https://cdn.shopify.com/s/files/1/0451/8959/5287/files/bts_world_affinity_spreadsheet.pdf
    • https://static.usrfiles.com/ugd/5ad03d_be6b5f1a4ef041698171e5bde4aa2c41.pdf
    • https://static.usrfiles.com/ugd/b8c837_41741e7f48c141b7bf49d0f3b2fdd660.pdf
    • https://static.usrfiles.com/ugd/b8c837_f09e7c95316f4fa48aca75a811768719.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc75df98817d440eaba87af0d092cd52.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e59c406f5943ea85f6bfef37352d0f.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/races_of_faerun_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/31075527111.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/frost_lord_ahune_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/best_ps3_emulator_for_pc_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/miziwimilamasiliso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000710b.bin
2dbf49accd552004306b3d5c93d70c669b25253d4ac1ca83e7f1410d248835bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710B 5224 bytes
font_01_sfnt_off000082e3.bin
c7a86be81db948b3935dd9b14dd7e4f053e66f9a6c5872aa2337d71560b2a852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E3 10492 bytes
font_02_sfnt_off0000a6b0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B0 4324 bytes

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