Malicious PDF — malware analysis report

Static analysis result for SHA-256 4463a2eec06d0d50…

MALICIOUS

PDF

45.0 KB Created: 2020-10-02 20:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88e43efeb805beedfbc2dc4e2d3e32ae SHA-1: 954833ed57f0b6cf1ea9130be455b2780db8e4ea SHA-256: 4463a2eec06d0d501e4cad665e2ec501a83a1b272da3a1e2be5c26ca1c8e4729
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/strik?keyword=como+aprendemos+a+leer+wolf+pdf'. This URL is likely used to redirect users to a malicious site for phishing or malware delivery. The document body also contains this URL, reinforcing its role in the attack. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=como+aprendemos+a+leer+wolf+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/pideg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3008/6297/files/messages_the_communication_skills_book_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/htc_m8_instruction_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/keninaxegoporadirileni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a099c0-8720-400d-81d2-8b0206f92b4e/17552390664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31f0bf7-1af3-4667-be75-5d130eb9d07b/57773799027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/church_mission_statements.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7865/4883/files/kaxopidumikudogizawuzele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0198/1339/files/how_to_hack_gangstar_vegas_world_of_crime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1560/4904/files/mario_-_let_me_love_you_release_date.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3868/7900/files/jacksepticeye_sam_dog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7782/4412/files/games_like_toon_blast_with_teams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/the_martian_google_drive_hindi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 5184 bytes
SHA-256: 9075f9f3bf6375ebac26adc0119b44c941a25394990c5741126c2e06cbfacb2b
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 11756 bytes
SHA-256: 240b1b3b10ad23ec805bfe29508e837799a686897e42b91943c4a887c4812f1d

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