Malicious PDF — malware analysis report

Static analysis result for SHA-256 93159187f3edefaf…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 12:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 785e8cb4800342d7a14d3f0e19399d59 SHA-1: 3858d794fe6da5534fa4212b29f3f9b51a8e1abd SHA-256: 93159187f3edefaf198ba42dc5669e91ba165e948544342f7d962160a99de5f9
120 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a syllabus download. The document body is heavily obfuscated but contains the primary malicious URL. The presence of numerous other Shopify links suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

Heuristics 3

  • 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.
  • 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=bpsc+pre+syllabus+2020+pdf
    • http://files.milleratcree.org/uploads/1/3/1/4/131437276/634af2a747.pdf
    • http://files.skipcrowther.com/uploads/1/3/0/9/130969939/jalabanigut-kamupe.pdf
    • http://files.westtxwinetours.com/uploads/1/3/0/8/130874030/jokuribajemevoxe.pdf
    • http://sewugone.guysamc.co.uk/uploads/1/3/1/0/131070450/0b79fbbe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/61137130492.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/application_of_buffer_solution_in_pharmacy.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/74754210795.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/numuvos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4732/1751/files/contract_mining_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/92213334492.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/canon_eos_m3_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/palindrome_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/34609931874.pdf
    • https://cdn.shopify.com/s/files/1/0439/7305/0526/files/pdf_editor_multiple_pages.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/91490674013.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_off000070a0.bin
4c6408c19079441941c877f45eefe5fe18864ffd5e8cb9fc9f92b37ddbb517b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A0 5716 bytes
font_01_sfnt_off00008424.bin
42f817deb1b24a7d18b27a11d775d93d141771bc17f2c8f2fd2110bc592bc06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8424 10412 bytes

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