Malicious PDF — malware analysis report

Static analysis result for SHA-256 1473b3c1e534ecd5…

MALICIOUS

PDF

47.1 KB Created: 2020-11-04 07:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f1fa26452e6c3caf30a779913fc4151f SHA-1: efa8518250e0da98208a78c2a0e4e162796e6d7b SHA-256: 1473b3c1e534ecd5064262b1d4b0008c110101d9fc0b589a2072dae02f09dcdc
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body and embedded link structures suggest a lure for free downloads, which is a common phishing tactic. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.
  • 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.cc/123?keyword=musicophilia+oliver+sacks+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f8dd49072c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f875ab216912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f9b0675f2503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f889acdad7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f8b6ffef284a.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/55fd76ca118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5f99647a2166a.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/96c1887e-064d-4e0f-988c-5ab6957d16e6/42229192921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0537b9f8-f556-48f1-a94b-72302180fc1c/26023728258.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/free_spell_casting_skyrim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beed06a3-6cd0-4044-8105-2d4550399dd7/47782118219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e664ad6e-e688-47fb-90fb-ef25bacc448a/how_to_get_better_aim_in_fortnite.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_off000079ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EA 5372 bytes
SHA-256: 5d00f863d1ac93061b2cd41da949880a12bfe498c8db60724a0c2422d447426e
font_01_sfnt_off00008c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C41 10504 bytes
SHA-256: 7070907b78433c58f576e57d05aa01f1bc8f61d7630ee4fb36a99ef898995bee

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