Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0535975e2c751c…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 23:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80ec57d1d57756e35e50f641d8df121 SHA-1: 469b9d4268eb9f4d6655ae9e147d1500cc0a1dcf SHA-256: 0a0535975e2c751c23275b20ed12d9d6473f1c3894788ef398d49913eb9170d7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though partially corrupted, includes keywords related to hernias and a URL that appears to be part of a link farm, suggesting a deceptive lure. The presence of multiple external PDF links further supports the SEO link farm heuristic, aiming to drive traffic to malicious 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.com/pify?keyword=hernia+de+hiato+alimenta%25C3%25A7%25C3%25A3o+pdf
    • http://files.midkentmnd.org.uk/uploads/1/3/1/3/131397981/dasafonaku.pdf
    • http://nexugaf.ethics-based-on-science.com/uploads/1/3/0/7/130775732/dbf56ff2.pdf
    • http://files.rejuvdayspashop.com/uploads/1/3/1/4/131438847/reviwusanori_todepuvinufaran.pdf
    • http://files.oakleystables.ca/uploads/1/3/1/0/131070149/ravogik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/xepigefamosis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/wuseweropu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/6816863989.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/intermediate_financial_management_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2700/4577/files/vefulezazojuwojegazobekug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/robiwekerumef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/24134154335.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/zokitupimozor.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/java_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/merge_sort_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/auld_lang_syne_piano_easy.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/kigekatetexuwodibax.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/xepodopomutiwajoxezed.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/43948910146.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_off00006a88.bin
b568a4ff093bcb4559f484228c1a9ac0896522d6f096456411624eaccb4e91e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A88 5564 bytes
font_01_sfnt_off00007cb3.bin
b00a5aeb6c9524b899600323641957877cc3a80e51fb509fee835c52b8de804e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 12604 bytes

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