Malicious PDF — malware analysis report

Static analysis result for SHA-256 b049d71e297b8f93…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 10:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f05f6ccfa82a35093fb1ed14f40eeb SHA-1: 2115e316cbca69e942461cbcdc6a8f49761c838c SHA-256: b049d71e297b8f939a8b676bdd594efed285f49b84fd707c618e369c39b94a53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites. The primary redirector URL identified is ttraff.ru. The document body, though heavily obfuscated, contains references to academic topics and the URLs themselves are often disguised as links to PDF documents, suggesting a lure to trick users into visiting malicious infrastructure.

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=assisted+reproductive+technology+in+farm+animals+pdf
    • http://jebor.mybasketball.ca/uploads/1/3/1/4/131406744/2c3a7e982.pdf
    • http://parafirij.alba-a-new-dawn.com/uploads/1/3/1/4/131437601/1e8bdf8ffdc7.pdf
    • http://megoga.misspankhurstslearningspace.com/uploads/1/3/0/8/130874493/8fd1fbfc70f15a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/bachelor_of_computer_science_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/54420592820.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/potiputadufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/jusiredubopurut.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/15882688463.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7420/files/fundamentals_of_labor_economics.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/alphabet_arabe_debut_milieu_fin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/puleloseluzuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/mukepisijele.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/mowoxubuxizori.pdf
    • https://cdn.shopify.com/s/files/1/0448/1017/4630/files/42534681125.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9136/files/asco_solenoid_valve.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/41334356083.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/packed_bed_adsorption_column_design.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006733.bin
ad1e4de201f5fa16b054189a9fa919a0a8ef2ecd46fb02764ac152102bd87d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 5720 bytes
font_01_sfnt_off00007a82.bin
205cff784f68dca6b6b11b31d80abefe91827c5d4c601d82c9d0aa959305755d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A82 9980 bytes

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