Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d8966b869964d…

MALICIOUS

PDF

44.1 KB Created: 2020-08-20 22:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eaa622150dcb86bd93638eae089676e SHA-1: 388a8cbadfc302a169c3561f1b354c2134441b8c SHA-256: 0a1d8966b869964de31ac8c42a1bbb671fea879e9211ee6a6f5246abb9e7857f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external resources, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to funnel users to potentially harmful sites. 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://ttraff.cc/pify?keyword=algebra+word+problems+worksheets+for+grade+6
    • http://files.icgrenoble.org/uploads/1/3/1/4/131406491/nexolimipiduv.pdf
    • http://files.sisiholisticbeauty.com/uploads/1/3/1/4/131438571/bovigevudo.pdf
    • http://files.eliseblackwrites.com/uploads/1/3/1/3/131381612/31c5308.pdf
    • http://files.premiumrvtrader.com/uploads/1/3/1/1/131164386/891377b83360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/92147521978.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/66154114156.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/84468773854.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/lagededuxoga.pdf
    • https://cdn.shopify.com/s/files/1/0439/3939/7790/files/curso_de_apicultura.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/sutidufeviber.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9610/files/wp_engine_disallowed_plugins.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3511/files/gudosiwaxexobipo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/john_deere_335.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/autocad_for_windows_7_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/possessive_nouns_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/86995459327.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/panurufevini.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_off00006afb.bin
3c7a96a9ec0f6d3dbb3a3d2f7ee094c7028772ae31c4ed80e8701285c8fb8b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 5896 bytes
font_01_sfnt_off00007ef3.bin
a7352282cdb7ff208b0412167670fd8010fe6ab93fbacad6afd43c2103331d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 10604 bytes

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