Malicious PDF — malware analysis report

Static analysis result for SHA-256 625a1a6ef6684150…

MALICIOUS

PDF

40.8 KB Created: 2020-08-07 08:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a548f88a6edf1d88b20147836670f6db SHA-1: ad8d5f995138277b72b664445ec20f0661088bc0 SHA-256: 625a1a6ef668415072ed0a769b17c156184b92cd6cc7df988f38d36aa21ce377
194 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, disguised as a tool to combine PDF files. This is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external resources, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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/wb?keyword=combine%203%20pdf%20files%20into%20one In PDF document text
    • http://files.alaskarvadventures.com/uploads/1/3/2/6/132681336/fdfd3d.pdfIn PDF document text
    • http://files.newhampshiredreamhomes.com/uploads/1/3/2/6/132695568/boxufegowetixog_tivavej_podukakurolo.pdfIn PDF document text
    • http://files.becomeaconqueror.com/uploads/1/3/0/9/130969370/kezujoxukaraken.pdfIn PDF document text
    • http://files.alicianicolephotography.com/uploads/1/3/0/7/130739081/ea80da.pdfIn PDF document text
    • http://files.humandevelopmentzone.com/uploads/1/3/1/4/131438313/8841672.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/1/0431/2950/3908/files/wuvunujagafakuvoxonufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/57766402328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/am_word_family_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/1000_microfarad_25v_capacitor_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/binary_search_worst_case.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/vojivapapukupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/12671306122.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/latisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1687/0296/files/37013424306.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/68739776123.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 6

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_off000061c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 5088 bytes
SHA-256: 9b672cab96b4ef617f9c7028928cc3a2c2e50fce7f53cd0e8b052a7a609316f0
font_01_sfnt_off00007301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 10364 bytes
SHA-256: 6888f2f9f489d823070ca0a24b903710d17f96df57c6cdbbb684dcdfc23cfd3e

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