Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a674b2108c7699…

MALICIOUS

PDF

56.2 KB Created: 2020-08-25 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3f4da1c36270c0b21eab31968887c88c SHA-1: 040aa8f153c6d957f89cb524a534347f524d793c SHA-256: 85a674b2108c76998ebf42b72d04a0dab96b3b053c57fef5b48a1a4655a8bbd6
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to performance appraisals. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm strategy.

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=performance+appraisal+sample+overall+comments In PDF document text
    • http://files.thrivingdrs.com/uploads/1/3/0/7/130776204/5770433.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/1/0430/8199/0304/files/36413787671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/cambridge_english_fun_for_starters_student_s_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/birmingham_city_university_postgraduate_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/suwoluz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/2nd_grade_math_review_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/vekilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/sazumakerezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/37723751314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/gabimebemipebujegadaxiwik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/23474510819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/sazativogesopeguganoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/s_s_pandey_sociology_book.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_off0000a09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09E 5220 bytes
SHA-256: 0914ffafcd720bf6c4e01eb3dedd6b67d3cf42f72a0f1585228f2105b5c450cd
font_01_sfnt_off0000b24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 9776 bytes
SHA-256: 8a9bf0a784d4ad8ff1183eaed42bd7abb954635009b6f6ea07ad3c0b7588831e

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