Malicious PDF — malware analysis report

Static analysis result for SHA-256 0372ad756567ae8d…

MALICIOUS

PDF

35.6 KB Created: 2020-08-25 07:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095dfd49065e649e9f1464b98c41f426 SHA-1: 1045639c4526d49c53efb7bf6dbc2bffa3c85a5d SHA-256: 0372ad756567ae8d3392072a40b4d93ab1073be361f744daa664f04e2a315704
154 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 Shopify domains hosting PDF files, but one critical link directs to a known malicious redirector. The document body text, though partially obfuscated, includes the phrase 'Icivics race to ratify answer key' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=icivics+race+to+ratify+answer+key
    • http://files.viviankeenan.com/uploads/1/3/2/7/132740413/e98f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/bhu_uet_agriculture_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8362/files/free_birthday_gift_voucher_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/wanijuvobivaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4446/9927/files/dumagofodamadok.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/parallelogram_method_of_vector_addition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6634/files/gidixudidofosavenatuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/fuwudaxutopujazemawox.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_off00004ecf.bin
8a5fa912a4e35637cfffea0f68ecd660cdd54fcf727818b05666243c59e5f4bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ECF 5096 bytes
font_01_sfnt_off0000604f.bin
0c144de81b5b1b76853bd430b0ec9b8d97fc5b90a333c639f921d442e11b0246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 9992 bytes

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