Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e463d43ec051cb…

MALICIOUS

PDF

41.4 KB Created: 2020-08-11 09:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1405105c961b0d608e38608180de0926 SHA-1: 12cd797fffa42d58a55110e32d55632620ae8d30 SHA-256: 46e463d43ec051cba70ea97261382d8713071e67fb33287446d1e8a27d5746c2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=west+ada+school+district+calendar+pdf', which is flagged as malicious. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to lure users to malicious content. No scripts were extracted from this sample.

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=west+ada+school+district+calendar+pdf
    • http://doxowa.aacnationals2016.com/uploads/1/3/0/8/130874493/7016972.pdf
    • http://files.nathankhensley.net/uploads/1/3/0/9/130969932/9d4c0.pdf
    • http://files.classicalmusictoday.net/uploads/1/3/1/6/131606366/925c6ed28ef7bc.pdf
    • http://files.marissagable.com/uploads/1/3/2/3/132303226/309440.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/wakidegevilalatipavap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/24137740311.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/calculus_early_transcendentals_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/59444520788.pdf
    • https://cdn.shopify.com/s/files/1/0440/4841/6933/files/78842613999.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/daxev.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/20674896260.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/31009045240.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/jedamewiwatomu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7436/files/business_plan_template_sba.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7430/files/basic_accounting_interview_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/8185617791.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_off00006234.bin
98086507b4162eadda09c3d31b40e77759aeca64ba73f15337159128680cc0d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 5256 bytes
font_01_sfnt_off00007413.bin
cf054e15fd1a737f639719bdd3c2e5d1861dde442c9366492400b241d23bd300
pdf-font-stream PDF embedded font (sfnt) at offset 0x7413 10188 bytes