Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73deb31ef51721…

MALICIOUS

PDF

49.1 KB Created: 2020-08-17 17:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a93d7b3188d95b497cbeb934805a4c78 SHA-1: 84a9c862ca10c5e5a57102879e6cbc243906d5f9 SHA-256: 4c73deb31ef51721b1684521f78ee6453ef673caaa344f542486c6187ac2649d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains text suggesting a formal request, which is likely a lure. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=formal+letter+for+request+format In PDF document text
    • http://files.nuggetfest.com/uploads/1/3/2/6/132695336/448f718288040d.pdfIn PDF document text
    • http://fifeb.bridgetbuildscharacter.com/uploads/1/3/2/7/132740249/93fe207e5a.pdfIn PDF document text
    • http://files.visiblegreenhome.com/uploads/1/3/0/8/130813762/dolapapikevaz_wepumeduja_liroz.pdfIn PDF document text
    • http://files.paminingprofessionals.org/uploads/1/3/2/6/132695428/9898824.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/1/0431/0253/5840/files/jefapumipor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/linked_list_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2979/7787/files/gudanigopak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/english_language_proficiency_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/divusekugolobemafozej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/monitoring_and_evaluation_skills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/zilufowazaboxesetub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3505/7566/files/kusamudifonagomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/vomixinakesuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/28661000490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/spring_batch_tutorial_espaol.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_off000082f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 4992 bytes
SHA-256: ad44232dc6dfcd564a92608a36b61c4a5c833312ecfae9ef2dc1f65bb7f55cdc
font_01_sfnt_off000093d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D5 10304 bytes
SHA-256: 64e6dafbc6123a8b04d06882d4972ff8b145349952cb9dff01fb45a2076db9ae

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