Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c865245c2fa760…

MALICIOUS

PDF

42.6 KB Created: 2020-08-06 07:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1e1283454447aea8429cbd4a3bda4abc SHA-1: b841d331569c49d5c695cacccf6d7e0e0889efbb SHA-256: 37c865245c2fa760d1e6209a35776f86de782324114de63ee6902e4340dfd495
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'manual peritoneal dialysis video' and includes the malicious URL, suggesting a lure to a scam or phishing site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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/wb?keyword=manual%20peritoneal%20dialysis%20video In PDF document text
    • http://files.kmbestpractices.com/uploads/1/3/1/4/131437657/9ae2b0.pdfIn PDF document text
    • http://files.littleredfoxcosplay.com/uploads/1/3/0/8/130874113/7537207.pdfIn PDF document text
    • http://files.asia-days.com/uploads/1/3/0/7/130776775/wirurak_polovuwakadiner_fabemopofo_bozoxu.pdfIn PDF document text
    • http://files.dameliart.com/uploads/1/3/1/0/131070792/lomoxor-lijapuzi.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/1/0429/8155/6375/files/6707615604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/pivabowenopexavukofozej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/prince_george_s_newsletter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/31933854807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/zoridazirerizajikufozaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/88091679426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/jivanujosedimerubozagoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/bisoneso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/nusotiwodotexopeberumi.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_off00006bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDA 5120 bytes
SHA-256: 24da045b735b41e27cd381644eaae60f4d2ce72ed829690e88f0f0fb0d5683a5
font_01_sfnt_off00007d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6C 9404 bytes
SHA-256: da0481d04f65c308bed6e25f6bd884e7bf78a32db76497f65d472152ec092562

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