Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b68e5610339afe4…

MALICIOUS

PDF

43.2 KB Created: 2020-08-16 18:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e65087dc3c36312eb9c8ea51ae3372 SHA-1: d091339056172ac89fe5e86933fd5a16bc09b68d SHA-256: 5b68e5610339afe40b52d57591dab9f8d35639b28b7c6a6c8eaf8ca4691c7ba3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results, further suggesting a malicious intent to redirect users to harmful sites.

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=paracetamol+overdose+management+guidelines+uk
    • http://jemibu.kylepe.com/uploads/1/3/0/8/130813834/mosadatenane.pdf
    • http://lekag.tanimaherphotographs.com/uploads/1/3/0/8/130813453/zelaf-nazenoje-refar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/rugabeginuvogekumaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/open_channel_hydraulics_akan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/futake.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/lizaludok.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/bibiliya_yera_mu_kinyarwanda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/98796106840.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/79095515998.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/17284943493.pdf
    • https://cdn.shopify.com/s/files/1/0437/3938/1912/files/wetixadozifakesakogej.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/argumentative_paragraph_about_smoking.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/gurifet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/63404897890.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_off000061f3.bin
9561a73f0bd45d2b6b8937d9e16553651004afacb2625be3d26f7013a619a328
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F3 5384 bytes
font_01_sfnt_off0000742c.bin
6baa1621bc23baf438df63818e9024ef1c1b4f901c60796a62ebb79089166c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 13636 bytes