Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd71ae2183d338e…

MALICIOUS

PDF

33.6 KB Created: 2020-08-04 02:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a467666caa46632e88ca5ab3fac05372 SHA-1: f0b0aabf5f8d5d79fbc0261b8dadbb01db65f6eb SHA-256: dfd71ae2183d338e7166c276a5368c8f5a0855e2c4ca3d2fa219781ec1eb92d0
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as free book downloads, but the primary link redirects to malicious infrastructure. The document body text and embedded URLs strongly suggest a social engineering lure to trick users into clicking the malicious link. The ML classifier also flagged this PDF with high confidence.

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=new+cutting+edge+intermediate+student+s+book+pdf+free+download In PDF document text
    • http://files.cindyjaquier.com/uploads/1/3/0/8/130814680/ece93bb94.pdfIn PDF document text
    • http://files.noyirionworks.com/uploads/1/3/0/9/130969190/retilek.pdfIn PDF document text
    • http://files.sinnerstage.com/uploads/1/3/2/3/132303043/zigusuwuribesun_lulowopunoritez.pdfIn PDF document text
    • http://tuxeniso.earthandwaterwellness.com/uploads/1/3/2/7/132712109/0d1d707d9f16df9.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/1/0432/1122/7300/files/71824212309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/97589159167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/timber_mod_1._11._2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/youtube_to_mp4_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/craftsman_garage_door_opener_keypad_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/luwevodizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/age_of_empires_2_mac.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 1

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_off000044ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44AE 5740 bytes
SHA-256: 570108518afbf2a46d86c3a1193720cc4f9b156939ddc7ac5fdb95a7c14682a9
font_01_sfnt_off00005835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5835 9784 bytes
SHA-256: 53ce4f2198d8e7e574d168e4fc4ac70d4296ae58441fdaaf80bccf5bf3137e09

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