Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8aa06853966952…

MALICIOUS

PDF

39.4 KB Created: 2020-08-17 09:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb8ae580466ddc33038b2c47cb90607 SHA-1: 88d04974f1b702839182ee615ad315f12614d159 SHA-256: 6c8aa0685396695264998595c0b212fafaff926412b0a806142e1054832be15c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=cedron+propiedades+medicinales+pdf'. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or SEO manipulation tactic. The document body, though partially corrupted, contains the same URL and a title that appears to be a lure.

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/pify?keyword=cedron+propiedades+medicinales+pdf
    • http://nogap.biglittlebrains.com/uploads/1/3/0/7/130775413/goxowomavepibob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/penyelesaian_arbitrase.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/62677902189.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/head_shoulder_knees_and_toes_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/22578487468.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/96730696872.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/damijesesilasodozedujig.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/30873108119.pdf
    • https://cdn.shopify.com/s/files/1/0440/0775/1838/files/japikasojawin.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_off00005b58.bin
9839a66a0e3265162a2fe16ffc2d4d0036a65f6a98796ee118b7d40b2ae884da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B58 5208 bytes
font_01_sfnt_off00006cea.bin
2226c17b3e9af2fa9d7543cb5c56e874054035e19d60addfff59dd9a3c55e665
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEA 10616 bytes