Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4256542efccb76b…

MALICIOUS

PDF

39.3 KB Created: 2020-10-10 23:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e397ed4e986f53ebfc0f8d2ef6f8c9d SHA-1: 78b1a9d5bb068d7adfe274a481c12584de19c50e SHA-256: d4256542efccb76b33d22621731b4398b82708ef3c88b26e5668e848c2e73f28
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, disguised as a search result for an academic paper. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms the intent to lead the user to a potentially harmful site. No scripts were extracted, but the document structure and embedded URLs are sufficient to infer a phishing or redirection attack.

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://cctraff.ru/strik?keyword=organizational+behavior+in+healthcare+3rd+edition+pdf In PDF document text
    • http://files.narcabuserecoverysupport.com/uploads/1/3/1/6/131606813/pivira.pdfIn PDF document text
    • https://site-1043203.mozfiles.com/files/1043203/66148301280.pdfIn PDF document text
    • https://site-1043620.mozfiles.com/files/1043620/lozawusopiwiperidaxe.pdfIn PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/57443392235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec2dd4c-10c4-414e-8479-c463da424619/dilifalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafbc3b5-abc0-4b96-a7ae-9fb1eb91a727/28443009102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7743a339-5615-42f1-961b-0cccdccbb3c2/46030616198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8912/4258/files/locksmith_long_beach_mississippi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4634/0261/files/83702651722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6115/8303/files/concerts_at_mohegan_sun_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/brisbane_box_tree_images.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3731/4200/files/10698170067.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_off00005ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA2 5680 bytes
SHA-256: f0a7afad50016a905ea91687e3e7460c1fdcc1240d7a795698602b3f91bdb12c
font_01_sfnt_off00006ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 9476 bytes
SHA-256: 32b53d63a3e7c30c4dd9b8b468e0b3f3c833beaacea25714d97e728ecb6367d4

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