Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2df4c0e3680c2b…

MALICIOUS

PDF

38.4 KB Created: 2020-07-09 18:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: e67ddf28976fa9c11df9da5c39461fd9 SHA-1: 6b521b146deaca1ac1a8efd016fb3e4408a0fc26 SHA-256: 7f2df4c0e3680c2bff94f3b8bef2122d57dd8bb225febd81d1b90dbec197c509
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links that point to redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though partially obfuscated, includes a URL that is also present in the heuristics, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=alan%20carr%20child%20and%20adolescent%20clinical%20psychology%20pdf In PDF document text
    • http://files.diogenpro.com/uploads/1/3/0/9/130969834/9380885.pdfIn PDF document text
    • http://files.nsnaloxone.com/uploads/1/3/1/6/131637701/187473.pdfIn PDF document text
    • http://files.mygvhs.com/uploads/1/3/1/3/131379252/libuwozafe_muleduxigure_fujufawe.pdfIn PDF document text
    • http://files.mrsbscusd.com/uploads/1/3/1/4/131407155/zonutidigobi.pdfIn PDF document text
    • http://files.authorrebeccaarogers.com/uploads/1/3/1/6/131637034/wakobobo_jujorufaxeso_puxul.pdfIn PDF document text
    • http://files.dbtdelaware.com/uploads/1/3/1/1/131163563/2ca8fdf3d.pdfIn PDF document text
    • http://files.spgallagher.com/uploads/1/3/0/7/130739895/7729457.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nosuvul.files.wordpress.com/2020/06/pepulekafenexesedetonopo.pdfIn PDF document text
    • https://wemowuj.files.wordpress.com/2020/06/78224483332.pdfIn PDF document text
    • https://terokowexo.files.wordpress.com/2020/07/59698035334.pdfIn PDF document text
    • https://bulijedakuve.files.wordpress.com/2020/06/74867278474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98572357872.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5738 5296 bytes
SHA-256: c04d1aa06388c6059f79246240523f6f4d3884dc2ad467504cba27b6ab17c76d
font_01_sfnt_off00006930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6930 10296 bytes
SHA-256: d8710c11acd99d627b1679790e814a441023986f5c952db10f66cd206c3110f5

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