Malicious PDF — malware analysis report

Static analysis result for SHA-256 75634f135500f190…

MALICIOUS

PDF

44.6 KB Created: 2020-08-21 19:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ce41033f64dc8a157a3422f20cd321 SHA-1: fa773acc13b3e0b3f49f09cd6c6b47fcbbcb31e1 SHA-256: 75634f135500f190b46ba28895c7bdc542a237c16d9a817d86a0facc2b99bfaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the heuristic, suggesting a lure to a malicious site. The presence of many external PDF links, some benign and some unknown, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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=encyclopedia+of+philosophy+volume+1+pdf
    • http://tisogevos.teambethfoundation.org/uploads/1/3/1/1/131163690/65c97a6ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0429/7218/4732/files/jafopoliralumuzijika.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/opposite_words_in_english_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/87646126594.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/69062236028.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/58252589750.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/26714933586.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/international_accounting_standard_27.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/evolution_botany_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/nifobuvevukimupumuwulavof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xasaxikopakepiditewevumub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/bootstrap_template_for_tutorial_website.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/1004/files/zizonavugajesupefidow.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/physics_for_scientists_and_engineers_solutions.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_off00006f81.bin
ab294bf057360e70420e6a4af23dbff34dae8ae6ec7a1bb8c3f0ee53283aa3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F81 5472 bytes
font_01_sfnt_off00008208.bin
d23c46984281becf46e246da981c3885f5dfe775b5cd825f69b3c84be849482a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8208 10428 bytes

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