Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c93ee863b41f9b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-17 11:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a3945d371b2dbc53b9998d86666d438 SHA-1: d05558d9b9333b344cee40295e570cf35123fbda SHA-256: 02c93ee863b41f9bfff96aec51f1d9b42e06e6b19ea94fa2e6fd561c636209ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, includes the target URL and references to PDF files, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=cluster+sampling+advantages+and+disadvantages+pdf
    • http://vosifi.biggleswadesquash.com/uploads/1/3/2/8/132814930/perobu-vovunaxit.pdf
    • http://files.pedicureastridpeperkamp.nl/uploads/1/3/2/6/132682542/toburelarupuxif.pdf
    • http://xobis.eternalpurposeministries.org/uploads/1/3/2/6/132681021/291332.pdf
    • http://xerel.warkprimaryschool.co.uk/uploads/1/3/0/8/130813612/1304350.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/md5_checksum_utility_v2._31.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/minecraft_set_time_day.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/42155059905.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/analyseren_in_kwalitatief_onderzoek_boeije.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/juzeserusokenesanojufan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/plantilla_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/gartner_report_on_crm.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/49170164810.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/67386720602.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/the_odyssey_translated_by_emily_wilson.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/wudetalixawazogix.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_off00006eba.bin
f7cf56ff667a50056e39ea9ca959f914ee6035424937bba2ba7c4a41ebaaf8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 5324 bytes
font_01_sfnt_off000080c5.bin
badff5c5d1edc19d5b09a975726da368fd58ecef58c0b42e6bd3a8f14243bc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 10332 bytes

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