Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a013a489ed5de9d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-11 18:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47ffb586be7706d2310e51686bb99f88 SHA-1: 12936092918b578191144df9d37b1500e85cfeed SHA-256: 6a013a489ed5de9d69b2022db5c2ff0c4da1265ee72a15c25f130c284341baea
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host malicious content. One critical heuristic identified a PDF link to a known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, also contains URLs that appear to be part of this link farm, suggesting an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=a+comunica%25C3%25A7%25C3%25A3o+terap%25C3%25AAutica+na+abordagem+centrada+na+pessoa+pdf
    • http://files.lukesconcrete.com/uploads/1/3/2/7/132740595/jagiwolisexakupotawu.pdf
    • http://sajaruxur.centralflhomeeducationservices.com/uploads/1/3/2/6/132681670/4012794.pdf
    • http://files.freedomhoops.org/uploads/1/3/1/4/131453536/9919727.pdf
    • http://files.theapostolicinititative.org/uploads/1/3/1/3/131398498/be116017a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/2349041775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/92529166518.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/41140788493.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/primer_of_public_relations_research_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/convert_bin_cue_to_iso.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/81737239426.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/zunopelepitabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/16602434784.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6393/files/40534019907.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://www.repositorio.ufc.br/handle
    • 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_off000060ad.bin
16f4b740aa0d6791b51a746317be0ff3c2026ae735c22fdbcb2098020fec8e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 6220 bytes
font_01_sfnt_off0000749f.bin
7ecf0d6d6f686e50125fe7b6add4e469065998a236df362782e6652d5be2f436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 12344 bytes

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