Malicious PDF — malware analysis report

Static analysis result for SHA-256 5519c4b741c56687…

MALICIOUS

PDF

36.9 KB Created: 2020-11-01 07:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 259e63d8d8644c142bcccbf30f140379 SHA-1: 97a19a528a8c99f22f8306b794b137b58bf56307 SHA-256: 5519c4b741c5668702dbbf9bb436d8bce2554979d2123d6bb1ee62be14262a8d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a redirector URL, which is a common tactic for phishing and malware distribution. The ML classifier and heuristic rules strongly indicate malicious intent, specifically related to redirector links. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its role in the 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.
  • 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.com/pify?keyword=nordictrack+a2250+treadmill+troubleshooting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5f94bbd091c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f93f8a9e0baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5f9af680e8334.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/9cf13a28-75a3-4bd6-89ea-92c2256e6c8e/jevariwimavebegiwuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebb10d5-e35a-43e8-bdc4-8dcb93f8d81d/xitegerelejezurakevipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8256/5782/files/visible_time_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/cavitron_touch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1887/7626/files/92437620305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/root_word_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0572acd9-d809-4c61-b6c6-e58df15d8518/wefakanisegevutinituv.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_off000050f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F5 5924 bytes
SHA-256: bac314b2538e2f68069efb13037e984f2ef57f89dbeab090c242ea38cc94eeba
font_01_sfnt_off000064f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F6 9948 bytes
SHA-256: e2281abf9b449c63870ddb9b602fa0826eb7be35e6dad93930ba8eb49db6b89e

Open this report in the interactive analyzer, or submit your own file for analysis.