Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43b5ed8d0165c7a…

MALICIOUS

PDF

45.8 KB Created: 2020-10-31 06:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1731ed91b3335071a7a661839cb0662d SHA-1: c2d4efa9c798d4841e15f1fb2eb07113c3c21fed SHA-256: f43b5ed8d0165c7a344b62acdfad30cea59256eba756bd89d921c84503b99019
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as academic material. The ML classifier strongly indicates maliciousness. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.me/123?keyword=managerial+accounting+chapter+9+homework+solutions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8a4a5c0405e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f92915cc9b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5f9acc2b30af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9378cbe9dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f90bc5dde4e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f957b4765ffd.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/6878fb88-e803-4b01-a593-1fa4f52e657d/financial_accounting_harrison_11th_e.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/home_sheep_home_lost_in_london_not_doppler.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/vumisetoditibipeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d36bed3-c2fb-4727-812c-905f40f0483d/94001026304.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_off00007198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 5664 bytes
SHA-256: 76cd6138bce26fcc76ea797fa29cec354e7a7c356927b8b8042a7fd52f70e0fb
font_01_sfnt_off000084d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 11076 bytes
SHA-256: 9fc2da050b7569c170f93d33421d726c641467d99ce910cd578481b0a94ce66e

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