Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebf63cc38d7e49c…

MALICIOUS

PDF

47.9 KB Created: 2020-08-05 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 827aa9af44661268dcfc9a42ae34ccc9 SHA-1: 1551a44bb9f078d965e3886c1818684316ccc2ad SHA-256: 5ebf63cc38d7e49c89a94bda7a7b2457c3864d215c09c9c83dbad43258ebcd57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This link is presented within the document body, disguised as a PDF download. The PDF also contains a large number of external PDF links, many of which point to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. 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=carlos+marighella+minimanual+of+the+urban+guerrilla+pdf
    • http://fewolozog.rgvoorhees.com/uploads/1/3/0/7/130776262/tizuno.pdf
    • http://files.spectaclesdirectedinburgh.co.uk/uploads/1/3/1/3/131383377/9427869.pdf
    • http://lekizolif.grayinghockey.com/uploads/1/3/1/4/131437984/kebuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8157/9161/files/triple_scalar_product.pdf
    • https://cdn.shopify.com/s/files/1/0443/0381/0716/files/circulatory_system_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/15980557404.pdf
    • https://cdn.shopify.com/s/files/1/0451/3467/6133/files/cetoconazol_cp_bula.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/sigex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/11183643803.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/84356925648.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/tozarufijono.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/77821422100.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/jupizoduwefex.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_off000074d1.bin
d99936e8fd2f0748795f448532b69eb2fd714b47d5c258c7f55cbb6dfe3c92c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D1 5500 bytes
font_01_sfnt_off0000874f.bin
5f7639dc60f9ae35655e0b63bd721c5f9c687ad4d144f06c5ad35417d7a3d194
pdf-font-stream PDF embedded font (sfnt) at offset 0x874F 13480 bytes