Malicious PDF — malware analysis report

Static analysis result for SHA-256 512a5cf9cf36cefd…

MALICIOUS

PDF

38.0 KB Created: 2020-08-08 14:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b08bfe3d0d5c59337a10076fd4df44ea SHA-1: 71c55a043d7df894ee12a805eb211a4237591578 SHA-256: 512a5cf9cf36cefdbea966e4c16a1d5a788f9ccc79903ecca4d84171206ba2bc
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and malicious redirector are sufficient indicators of 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/pify?keyword=bear+scout+leader+handbook+pdf In PDF document text
    • http://files.woofgangkennels.com/uploads/1/3/1/6/131637896/0621e795e0f4ba9.pdfIn PDF document text
    • http://files.belgravia-landed.com/uploads/1/3/1/3/131384771/4112181.pdfIn PDF document text
    • http://wikex.powermoneywomen.com/uploads/1/3/1/4/131438216/8283150.pdfIn PDF document text
    • http://files.emilyeaglin.com/uploads/1/3/1/3/131384281/5571777.pdfIn PDF document text
    • http://files.backcountryexplorers.com/uploads/1/3/0/7/130775934/vevewadimawukasomox.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/1/0433/1785/4373/files/trastorno_del_espectro_autista_de_alto_funcionamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/b._sc_2nd_year_maths_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/fepexawemugepiripapin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/fedivovot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/business_plan_for_seafood_restaurant.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/sigirazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/73310433424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/lodedufakufumizinifalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6130/5756/files/40468269173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/10014803086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/95173602600.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/0973/1734/files/jspdf_autotable_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/67530807742.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_off00005540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5540 5496 bytes
SHA-256: f2f238dda9a84eb3a2b8a61a5d8619b261413d9b3124f11455a4d06d029d8a5b
font_01_sfnt_off000067de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 10212 bytes
SHA-256: 059af9ba8e7e20ac6482d7974892f2bae6b0812214d1568012f5f360afc2d069