Malicious PDF — malware analysis report

Static analysis result for SHA-256 6951135da773b08e…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 17:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e0a9d1e9bff08572dfd48df6db2af45 SHA-1: e0b86b78cd9b983dbd9edc237cfe6b4f6fde8fa7 SHA-256: 6951135da773b08e9e49909928660e69491e80a2e3f31e17774cabdf5e7c02f7
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to suspicious or known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to create a link farm for SEO poisoning or to direct users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links implies an intent to redirect the user to potentially harmful websites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=solu%25C3%25A7%25C3%25B5es+isotonicas+pdf
    • http://files.root2riseyogaandfitness.com/uploads/1/3/0/7/130776088/7716605.pdf
    • http://files.pa4sc.com/uploads/1/3/1/1/131164402/gagitozivi.pdf
    • http://files.assessormag.com/uploads/1/3/0/8/130874278/4872039.pdf
    • http://jivapu.rawpetfoodtennessee.com/uploads/1/3/0/7/130775045/gemuru_gefowonojubevin_nadeb.pdf
    • http://files.kentuckysocietyforrespiratorycare.org/uploads/1/3/1/4/131453256/kudata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/bepudanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/posomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/lodaferivexukuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5890/5759/files/kezonaxaduwigovepajidanep.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/nifabesexaripupulerubafew.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/tofimutefiparis.pdf
    • https://cdn.shopify.com/s/files/1/0441/2823/9768/files/physical_science_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/lofopuzujegesetosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/mefuvuwuzenel.pdf
    • https://cdn.shopify.com/s/files/1/0438/1288/0541/files/pneumonia_tipikal_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/chevy_astro_repair_manual_free_to_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/30251082680.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_off00006369.bin
d04ecc4b95eb47500d007092eb42174260951c9e0f64b968934aeda1454015b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 5556 bytes
font_01_sfnt_off000075d4.bin
7427352a683ad8a2a60edd33ec0da8652b4b854b5badc363af32714324cf069c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D4 14672 bytes

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