Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b6bad5d8b9786f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 23:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5289332df5275af66b37c6dfb78474c2 SHA-1: 9a75302de1b743e0abbe2d516bc0da93e3c4ca85 SHA-256: 17b6bad5d8b9786f0733f8b9264c7f74e165713772eca0a1c8b164c9efb86997
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, traff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'simple interest worksheet' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious redirectors and link farms strongly indicates a phishing or scam attempt.

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.com/wb?keyword=simple%20interest%20worksheet%202
    • http://xegidijun.thecornerofhealthandwellness.com/uploads/1/3/2/6/132681504/pebalisujesasu-lujonolulemafak.pdf
    • http://files.hanleyvoices.org/uploads/1/3/1/4/131437385/6901146.pdf
    • http://files.shorecapmgmt.com/uploads/1/3/1/4/131407635/3360892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/dekekorakotodaraf.pdf
    • https://cdn.shopify.com/s/files/1/0448/3055/6320/files/87715106283.pdf
    • https://cdn.shopify.com/s/files/1/0450/9289/6920/files/xipupesekudabogawutap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4885/files/apriso_mes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/busupekopekesup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/befalewimagufukuvogizol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/53649282786.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/lokejilagolepapomozunedu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/baby_names_in_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0437/2427/5863/files/breville_espresso_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/nasetuwinovupezesilutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6026/4096/files/bimal_jalan_report_on_rbi_reserves.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/97187960538.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/apache_tomcat_tutorial.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_off0000693a.bin
e276e2ce2e3e77fd6aa328fcbcc56e662b13de79d6a7e925526ed081e964f0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693A 5240 bytes
font_01_sfnt_off00007af0.bin
649938f509f575838b892b6177147837a513afa8a41a0e0ea33bbfb1506d775f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF0 10432 bytes

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