Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c42155214796e3c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-12 02:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed75eecce07017b24709e1e48ac55d6 SHA-1: 61648e958a3a12c4878377df831024793cbe9dfd SHA-256: 7c42155214796e3c4c380bf12a97d6b8b6ac1e2b489b50be8e5af1d9cf281b92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links to external PDFs, many of which are hosted on Shopify. The primary malicious link, https://ttraff.com/pify?keyword=functional+training+workout+routines+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing workout routines. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=functional+training+workout+routines+pdf
    • http://files.ballroommagicdancecenter.com/uploads/1/3/0/8/130873820/4855901.pdf
    • http://files.shaktishalayogaguernsey.com/uploads/1/3/1/4/131410012/solidejugamuwo-gagiperew-ridelawir.pdf
    • http://files.calconref.org/uploads/1/3/1/4/131437064/88a9a2947.pdf
    • http://files.feather-wax-shoppe.com/uploads/1/3/0/8/130874593/zebejedubi-waziju-kuwedijum.pdf
    • http://files.karaikudivoyage.us/uploads/1/3/0/9/130969427/setizazon_ragali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/42043900261.pdf
    • https://cdn.shopify.com/s/files/1/0444/4022/3911/files/download_soal_akuntansi_perusahaan_dagang.pdf
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/algonquin_park_map_canoe_route.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/zelujaravefaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7678/files/basic_computer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/roxadefat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/us_address_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/a_study_on_work_life_balance_of_employees.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/34265735404.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/kutikugodurozelopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/quasi_in_a_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0453/4947/0363/files/mafia_card_game_rules.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_off000064b2.bin
4d879d142afd7c574eeec57c8392a4e02b6e4a5ee87852153766dbd2e8529b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 5432 bytes
font_01_sfnt_off00007753.bin
e459cae341df18175ae2611740abf6e199155bd0d86954aa9f274fdfc526b54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7753 10024 bytes

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