Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb57fd13e82d1a5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-08 11:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d1eb49e0f5a15fa4fea53108670256e6 SHA-1: ef20c16a580a156d7e804120b8b683bf2b1a4f4b SHA-256: bfb57fd13e82d1a549c4200fcce43065425382f5df5e4b2433b1b88e5e283d84
202 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains the same redirector URL, suggesting a phishing or scam attempt to lure users into downloading potentially malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=learning%20embedded%20android%20n%20programming%20pdf%20download In PDF document text
    • http://files.allensteadham.com/uploads/1/3/1/8/131872017/f442287addb62e.pdfIn PDF document text
    • http://xudet.professionaleyetusc.com/uploads/1/3/1/3/131383377/luzenizonemu_kirovegipozag.pdfIn PDF document text
    • http://files.gabysartgallery.net/uploads/1/3/1/6/131606453/342fc47886.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/1/0439/3605/5454/files/21265227186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/save_webpage_as_firefox_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/pewonesokubiles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7543/5677/files/4539356906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/dabimelusexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/76369879582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/lofugokizuragurupitikopav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/57600731834.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6323/0116/files/investment_science_solutions_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/datukugapobatogidexebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/analisis_toxicologico_de_cannabinoides_en_orina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32686583269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/buy_roblox_exploits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/54107735870.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_off0000604e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604E 5356 bytes
SHA-256: 5c6ecfccd2bec9cdbadb9a7d4bb1d3784ec49c496142ee73290aaed284efe8dc
font_01_sfnt_off0000727f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 9908 bytes
SHA-256: 7752a2203f7ce1264ce8d5776ef316a9960ceb958accb5fd39a46adec84ff0d9