Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee558cebfde1a9de…

MALICIOUS

PDF

41.3 KB Created: 2020-09-01 17:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1faee5013c710b1a9ca29614877db7d SHA-1: 1d1c499af0880f6f51bfc3b8d495de4b280aa8cd SHA-256: ee558cebfde1a9dede495bf3d08c3e9f8ca2645c86f483e4b6c55742b48288f9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=relevance+of+biological+clock+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are benign Shopify URLs. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link within the document.

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/wix?keyword=relevance+of+biological+clock+pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/jeep_grand_cherokee_2014_limited_manual.pdf
    • https://cdn.shopify.com/s/files/1/0458/2860/4067/files/chess_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0450/8313/2056/files/windows_xp_professional_iso.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/buzubolamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9047/files/accounting_vocabulary_french_english.pdf
    • https://static.usrfiles.com/ugd/b8c837_99d81550f2d043c0ae25a9aa20ca5d12.pdf
    • https://static.usrfiles.com/ugd/f515ca_9dfdf3f4a7714cce9ce9fcaee9b114af.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_a27d51005d4a4c358b892adff12044cd.pdf
    • https://cdn.shopify.com/s/files/1/0430/1435/7145/files/wuwurivafalebipenus.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/26317907007.pdf
    • https://cdn.shopify.com/s/files/1/0451/4463/7605/files/algae_biodiesel_production_process.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/serabikisemijepurixovoji.pdf
    • https://cdn.shopify.com/s/files/1/0452/8193/5522/files/examen_atomistique_corrig_s1_smp.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/arabic_alphabet_in_english.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_off000062b9.bin
ec0a01ee251a325e6778cc58214c747015d5e92dacad5d1cefabacd44d3194ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 5320 bytes
font_01_sfnt_off000074f4.bin
eab5f3243409309430e2e6c1bdc275a02675f50a65b90a305e794c4d3bde430e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 10468 bytes