Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b72553adf8e6b29…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 20:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e6c952e1fdf7d921798e2b8f76df4ad6 SHA-1: b39203893e8b440f85ff953a1f1c09d655f9ec78 SHA-256: 4b72553adf8e6b2973f253695dbeefcead01b44a0a778e4f12690c745417e965
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, including one that redirects to a known malicious domain. The document body, though partially corrupted, contains text suggesting academic guidelines, likely a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector link supports this assessment. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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.ru/pify?keyword=secondary+source+apa+guidelines In PDF document text
    • http://files.letschoosejoy.com/uploads/1/3/0/7/130739766/rivexafora.pdfIn PDF document text
    • http://files.waltonrestoration.com/uploads/1/3/2/6/132682295/xipizimute.pdfIn PDF document text
    • http://gofotekag.shuntersmith.com/uploads/1/3/1/6/131636744/wotepalepurowat.pdfIn PDF document text
    • http://zimodazi.rogforslp.com/uploads/1/3/2/3/132302720/nizafon.pdfIn PDF document text
    • http://pawasu.giveusbreadandroses.com/uploads/1/3/0/9/130969057/vopajenu-ledov-bemigutat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/case_study_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/95027095292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/wugotus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2001/6024/files/mefuwalamosarados.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/past_simple_present_perfect_exercises_macmillan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6105/7438/files/gofexivasepiluker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/apartment_design_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/daxurabafatix.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 6

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_off0000609d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609D 5444 bytes
SHA-256: 5af00fab12de80893af044a35c2be79451bfdc9fc706f7bd134e6a02c9726135
font_01_sfnt_off00007323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 10304 bytes
SHA-256: 83bb4ae155d1f8e9f74a22727799859aeef9806534354574a9e03941a33c9d42

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