Malicious PDF — malware analysis report

Static analysis result for SHA-256 850cf84f054a747d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 13:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b59bcf81edecd807b8e804e31254f72d SHA-1: 37a2ffa642c3c6fc19c43a3fae62a32691daae78 SHA-256: 850cf84f054a747d2da817821906e812fa76321f3dd2f209a69621c3f7a69dea
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, likely a lure. The primary malicious URL identified is https://ttraff.com/wb?keyword=3-5%20slopes%20of%20lines%20worksheet%20answers, which is flagged as a malicious redirector. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.com/wb?keyword=3-5%20slopes%20of%20lines%20worksheet%20answers In PDF document text
    • http://files.dodlestonparishcouncil.co.uk/uploads/1/3/1/8/131856539/xazutoguwovuwobokib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/27719246987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6339/1894/files/how_to_remove_border_from_plot_matplotlib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/pobad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/5030824322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1835/3815/files/bruce_almighty_full_movie_dual_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/fejik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/1944/0028/files/une_bonne_hygine_de_vie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/32540424990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/susaladoromonezufi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 5156 bytes
SHA-256: d5913d658c167c02119593cef20a90b7d4b3abedfe4f002c54eff029325630df
font_01_sfnt_off00006b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 10856 bytes
SHA-256: 57f64d57cc05567ad346f132fde8c88ca6136d0ed45ee18ac5dcd8966f617bc8
font_02_sfnt_off00009055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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