Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cad7abc847de78…

MALICIOUS

PDF

45.8 KB Created: 2020-08-13 23:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63cbe1930d4213ec5c09aac7769471ec SHA-1: 99669c5a435245a9eb3c03ddbf2ad0a23de233a6 SHA-256: 09cad7abc847de78ab27cb9b4d7d66c522816709b91d6dc3be55e142fca8c4a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link directs to a known 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://ttraff.com/wb?keyword=conditional%20clause%20definition%20and%20examples%20pdf
    • http://bikefatep.nfjoyfullibrary.org/uploads/1/3/2/7/132740214/5859634.pdf
    • http://wudaz.imagineclayavenue.org/uploads/1/3/0/7/130775181/7467653.pdf
    • http://files.mpowertheworld.net/uploads/1/3/2/7/132740415/kadisetiwebuget_rofajanagojata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/84487866976.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/bpsc_ae_mechanical_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/18599343899.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/believe_in_yourself_murphy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/anti_form_sora.pdf
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/bunadojixeje.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/83782147227.pdf
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/bulls_on_parade_drum.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/naruto_op_8.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9711/files/bsc_3rd_year_mathematics_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/0802/2938/files/xokaxubumonavaguvisugegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/46174223037.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0152/files/44866184911.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_off0000753a.bin
df8f79b25d2a2b35e7d59c8b2f83261b597d223ddf7bca9787db475fca9e9091
pdf-font-stream PDF embedded font (sfnt) at offset 0x753A 5180 bytes
font_01_sfnt_off000086ce.bin
5acd2e26d9fe87215998f50db9a300798261c43345eea80737bf4f824c8dba72
pdf-font-stream PDF embedded font (sfnt) at offset 0x86CE 10356 bytes