Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b7aa21e4538d30…

MALICIOUS

PDF

43.9 KB Created: 2020-08-10 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 83281013759b64694ddfb15fc9fc8ece SHA-1: f8aa91aa82ee20576f89aa0218364d393f1fb070 SHA-256: 86b7aa21e4538d3018ab0b7a2d71450d13de4538e3faa33430d36fff9b47f5bd
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, masquerading as a study guide. The ML classifier strongly indicates maliciousness, and the heuristics confirm the presence of malicious redirector links and a link farm designed for SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site for further exploitation.

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=accounting+101+study+guide+pdf In PDF document text
    • http://files.getitwright.com/uploads/1/3/0/7/130776788/pufim-fafopunatobi.pdfIn PDF document text
    • http://files.darkstarent.com/uploads/1/3/0/7/130738914/1209636.pdfIn PDF document text
    • http://files.dearfriendfrank.com/uploads/1/3/1/4/131437949/7d5ba2dc5153f.pdfIn PDF document text
    • http://kafimis.rabbipauljacobson.com/uploads/1/3/0/7/130776407/jidida.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/1/0428/0736/1703/files/40230909084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/tinkers_construct_2_materials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/52298812620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/29855258191.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/jodi_picoult_handle_with_care.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/labikuma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/99424231211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/19582272980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/20422359951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/march_book_one_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/california_living_will.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/89810682076.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 5268 bytes
SHA-256: 053258db0920aabd4929e6033ece4fd4b663363eafb2c0bf7dd84019f5450c07
font_01_sfnt_off00008001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 10208 bytes
SHA-256: b6d2c0a38fbb4d3af5e46670edc28474576ae993379f05f91d53f9a1f3d657f5

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