Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fb8fc13bddba2d…

MALICIOUS

PDF

49.7 KB Created: 2020-10-16 05:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e72b920d65a9b37609bcd7e177a8b49 SHA-1: e5e651965aa933763d86313b31c4a9546d531f4a SHA-256: 93fb8fc13bddba2d805bfbd34a1625a2599b6327464603e5d472983e5390e23c
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.club/pify?keyword=infective+endocarditis+case+report+pdf', suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent, likely to lead users to phishing or malware download sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=infective+endocarditis+case+report+pdf In PDF document text
    • https://site-1039517.mozfiles.com/files/1039517/81478542618.pdfIn PDF document text
    • https://site-1048208.mozfiles.com/files/1048208/26166605601.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/430361255.pdfIn PDF document text
    • https://site-1039183.mozfiles.com/files/1039183/79672316531.pdfIn PDF document text
    • https://site-1044057.mozfiles.com/files/1044057/famiminepilut.pdfIn PDF document text
    • https://site-1040282.mozfiles.com/files/1040282/79906636932.pdfIn PDF document text
    • https://site-1038925.mozfiles.com/files/1038925/atomic_design_ebook.pdfIn PDF document text
    • https://site-1039721.mozfiles.com/files/1039721/8380222565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f86fb5ea2f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f88c08194ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f88c59a9cb9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8801bcef6d6.pdfIn PDF document text
    • https://site-1039380.mozfiles.com/files/1039380/48226410286.pdfIn PDF document text
    • https://site-1044209.mozfiles.com/files/1044209/34460050178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5f890397c2203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f88fa8fa1608.pdfIn 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/1/0483/9420/7381/files/gejoxurutaniwejatim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/44982595966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5364/0608/files/easy_bat_house_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8566/0828/files/tisezoxegigobuwofawumip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3491/0103/files/stone_deaf_1_vs_2.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_off00007b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B68 5116 bytes
SHA-256: 31339e79c751fb9f0b4eaba43a95854918093bdc9308950e8e4738cbca949699
font_01_sfnt_off00008cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 14016 bytes
SHA-256: dbd473c929cd0ac394a15d1ef8dd70aea136bfd46bf34ccd84be539661369217

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