Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8558d7a3ccc54a…

MALICIOUS

PDF

39.9 KB Created: 2020-11-06 05:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c27d38938921da8d74182b55a7b25b99 SHA-1: d43327ffba7ea57ec0173d9ec7052692968701fc SHA-256: fb8558d7a3ccc54a7bfb376bae3ad4f1c7d92570baddc3c9c5a23c0b580ff635
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of these links, https://traffine.ru/123?keyword=etna+maine+sheds, is flagged as suspicious. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?keyword=etna+maine+sheds
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f86fed5967f1.pdf
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/punitetiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoxaneral/amines_class_12_ncert_solutions_download.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/25789991787.pdf
    • https://uploads.strikinglycdn.com/files/a02a5310-8819-4b2c-be0a-9b308d3d95b0/molunebovud.pdf
    • https://cdn.shopify.com/s/files/1/0496/2392/4889/files/36197220654.pdf
    • https://uploads.strikinglycdn.com/files/5d686663-44a8-429c-9bab-fcde62663cf0/20823885509.pdf
    • https://s3.amazonaws.com/zetare/55083937261.pdf
    • https://s3.amazonaws.com/takebemanijewok/the_nightingale_and_the_rose_symbolism.pdf
    • https://uploads.strikinglycdn.com/files/dfc07b36-5c5f-4037-ac95-a13e75f4115d/trig_application_problems_worksheet.pdf
    • https://s3.amazonaws.com/susonanezaj/nalenib.pdf
    • https://uploads.strikinglycdn.com/files/f4e4aef1-5a4b-4968-8802-2ce6c216516d/58160738192.pdf
    • https://cdn.shopify.com/s/files/1/0481/9900/8413/files/baker_koonce_intermediate_school_website.pdf
    • https://uploads.strikinglycdn.com/files/3057f7c3-6009-4ed5-81fe-6fdb23a9b759/all_my_sons_arthur_miller_plot.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_off00006014.bin
03ff8f152c5519d7c48a79ecd4c9f69cb4d02eaa443769eef7ca48879be4e5d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6014 4892 bytes
font_01_sfnt_off00007092.bin
bd0c655834165c3c054a2a18e49c820f04a4e336cd12c8671de313d8be140e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 10152 bytes