Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9a173506fa7ead…

MALICIOUS

PDF

34.9 KB Created: 2020-08-17 16:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 891e7f0efe2cf79db6eabbafa3bef9ea SHA-1: d398fb531e8d7f023313cc4cee3c451dd9128fb1 SHA-256: ab9a173506fa7ead6fad7ee402e7ab2b06ed2a486adabfc343a929a5c0348781
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the same URL and a worksheet title, suggesting a lure to trick users into clicking the malicious link. The presence of numerous Shopify-hosted PDF links indicates a link farm strategy to improve SEO for malicious content.

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.ru/pify?keyword=ordered+pair+solutions+to+linear+equations+worksheet
    • http://mebesib.swindispensaries.com/uploads/1/3/2/6/132681670/9599ab3d.pdf
    • http://zuparam.lifeword.nl/uploads/1/3/0/7/130738714/xagibukugi.pdf
    • http://files.dakotaashleymarie.com/uploads/1/3/2/7/132740639/dd3bcffaa44e7.pdf
    • http://files.maaemi.com/uploads/1/3/1/3/131379439/4098184.pdf
    • http://files.the-word-is-out.com/uploads/1/3/2/3/132303238/276b26a44fd79c.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/jujimizisesekafijeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/letter_of_intent_graduate_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/penadaxisifidirav.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0056/files/lojadipofoxegula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0428/3016/8230/files/joxugisomazu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2401/3722/files/40978921845.pdf
    • https://cdn.shopify.com/s/files/1/0433/0776/1819/files/36948016836.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/agriculture_sector_in_tanzania.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/tonugixixagewugesasifix.pdf
    • https://cdn.shopify.com/s/files/1/0460/5771/7915/files/91741074750.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/fizotosodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3369/8209/files/kebirinavifaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/goldman_fristoe_test_of_articulation.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/sofevu.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_off00004d5a.bin
349d3ec10568ffa4b0a77f6a292a90884f8538787ff6d385b535ddb438f865b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5A 5356 bytes
font_01_sfnt_off00005f9a.bin
439b72dafd014fecd02509ae9bb213094728efe9f6ab67f70c6c8534ff2478e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9A 8876 bytes