Malicious PDF — malware analysis report

Static analysis result for SHA-256 221c925ddead00a0…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 00:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 692ff3eb9fae3b3c5d57d5ec082ff3c0 SHA-1: b5a4f450f5616c1df6d525ef3f2313fd930464a3 SHA-256: 221c925ddead00a09c22809556376024119da67bb965202736b5c15828de8d24
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=cladogram+analysis+answer+key+pdf', which is likely intended to lead the user to malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, reinforcing the lure.

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=cladogram+analysis+answer+key+pdf In PDF document text
    • http://medewizep.ordertiagos.com/uploads/1/3/0/8/130813612/2384041.pdfIn PDF document text
    • http://files.chewautomotive.com/uploads/1/3/2/3/132302894/9854966.pdfIn PDF document text
    • http://files.beccarothfeld.com/uploads/1/3/2/6/132695663/sapijevob.pdfIn PDF document text
    • http://files.oceanviewchristian.com/uploads/1/3/0/7/130739621/634471.pdfIn PDF document text
    • http://files.streamskinz.com/uploads/1/3/1/3/131398428/julupujenopo-jewidokosimadi.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/1/0431/9562/9725/files/wotin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/norton_field_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/52037869541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/9010984649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/25667921864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/conjunction_and_linking_words.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/18447008775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7896/5656/files/dovomoluxotafolewid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/88614792067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/44782721644.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 7

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_off000067d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 5524 bytes
SHA-256: 3b04906f674ab5b9f214574276b71eb98b93375c3dcb739691e1e06e98a6e1eb
font_01_sfnt_off00007aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA9 10228 bytes
SHA-256: 88981348a2de557ffe1b2c088136c58afc6481c0061c0718bd6915b0e0e9dac2

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