Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6303cda1ff977…

MALICIOUS

PDF

45.5 KB Created: 2020-10-31 09:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5146a0e7d1140ba005e6c522084fac SHA-1: 5fba7cd3690a903e1431a3d3256db322cfbe9eed SHA-256: 3fc6303cda1ff977c29d25138532f1ad957fd7fb819da4df7cd9c27a4c9a86bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, https://cctraff.ru/123?keyword=womens+gothic+clothing+amazon, is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/123?keyword=womens+gothic+clothing+amazon
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f9172dac0375.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f88b1547c830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0497/8363/6119/files/muwepebuxoz.pdf
    • https://s3.amazonaws.com/vidadaviwal/sejinifarifaduwakum.pdf
    • https://s3.amazonaws.com/nisoxow/mystery_hostess_usborne.pdf
    • https://uploads.strikinglycdn.com/files/8d3b4c05-79e1-4422-90cf-8da8f4624759/65674873234.pdf
    • https://s3.amazonaws.com/petikamov/durutawotunimusuzabitim.pdf
    • https://uploads.strikinglycdn.com/files/039bea77-9cd4-4ba4-931c-7bae6a4ec779/gowumox.pdf
    • https://cdn.shopify.com/s/files/1/0505/9294/0200/files/72910659877.pdf
    • https://cdn.shopify.com/s/files/1/0430/8870/7738/files/belobexexugefivimobu.pdf
    • https://cdn.shopify.com/s/files/1/0266/7993/5159/files/64345966152.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/active_to_passive_exercises_b2.pdf
    • https://uploads.strikinglycdn.com/files/f1b254a6-39c6-420b-bce1-1f18a3ae894d/46440189096.pdf
    • https://uploads.strikinglycdn.com/files/cbf64f44-e127-4e42-9118-d4cf4545e328/por_un_puente_que_lacera.pdf
    • https://cdn.shopify.com/s/files/1/0505/2416/0200/files/search_everything_app_for_android.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721b.bin
c8fa984032e8859baf2c6c685734cefd0a141f32e9d0e4792f26224d11aaac4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 5180 bytes
font_01_sfnt_off000083af.bin
75727e66b7f661f9943e3f329dd101ee2fa45eef282fc74070282c504c99b7bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 11316 bytes