Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c20659b8100278…

MALICIOUS

PDF

42.6 KB Created: 2020-09-17 14:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29d8e0f40979700b9e301d1213088d7 SHA-1: 3843c7f5857db412c1a86eaa64aed3130e4a3c3e SHA-256: 75c20659b81002783bf76fffd1d070b040aaf8635b8140f61847e4268c2a9b76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to potentially malicious websites. One such link, https://ttraff.club/wix?keyword=algebra+1+cc+midterm+review+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to external PDF files, reinforcing the link farm tactic.

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.club/wix?keyword=algebra+1+cc+midterm+review+answers
    • http://files.ellislakeresort.com/uploads/1/3/1/8/131857193/c83411.pdf
    • http://lubimexe.bearstales.com/uploads/1/3/0/8/130874379/navilofunu_guwozolomux_zifadaret_bupiroxano.pdf
    • http://files.barryswoodworks.com/uploads/1/3/1/8/131856852/zegozaxes.pdf
    • http://lelok.shawsblindsfairburn.co.uk/uploads/1/3/0/8/130814340/jepiw_gamilom_wexotazerimula_vemizozazepaga.pdf
    • http://files.bareandpolished.com/uploads/1/3/1/1/131163898/2144714.pdf
    • http://muwaro.cmmlibrary.com/uploads/1/3/1/1/131163725/1fc8eb08cd23.pdf
    • http://fowibu.bilgeceingilizce.net/uploads/1/3/1/4/131407802/dogalipabob_zeteveri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7766/4929/files/angularjs_service_vs_factory_performance.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/fallout_shelter_wasteland_survival_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/sulisutetunupup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/wufuseguwas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/lottery_number_generator.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/pdf_to_word_converter_online_free_for_mac.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_off00006584.bin
f24432d54484f70b771a0f69f5eb22a5ce12614e9dbb0feaae6b0a8c864dffd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6584 5592 bytes
font_01_sfnt_off00007889.bin
fa59a36563469458525f4a8b92995ce9c845fd5b21c0d34f912a5b4b384172d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7889 10940 bytes