Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8a36a41fa49c66…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 17:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a8c0e505cb10465a2117d95f538b74f7 SHA-1: 82a6cf6e2319db88b4c81c1fdffc2ab45244138e SHA-256: 8e8a36a41fa49c66fa59a90755f049a07a1adf7369b4ba6be64b609f7dc49fe6
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 domains associated with link farms and redirectors. The primary malicious link identified is https://ttraff.ru/pify?keyword=osteoporosis+causes+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'osteoporosis causes pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link farm. The ML classifier also strongly indicated maliciousness.

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=osteoporosis+causes+pdf In PDF document text
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdfIn PDF document text
    • http://files.gogirlempowerment.org/uploads/1/3/1/3/131384359/tizizozewaxol.pdfIn PDF document text
    • http://fikepoxiz.crkeenwoodworking.com/uploads/1/3/0/8/130874197/8594062.pdfIn PDF document text
    • http://files.divinaeventdesign.com/uploads/1/3/2/6/132681210/1688123.pdfIn PDF document text
    • http://files.taycarpetinstall.com/uploads/1/3/1/4/131406222/midumapoginel.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/1/0434/7219/1641/files/78313046501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/75851405656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/ludodafowitozam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/89731131738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9607/1589/files/68547849006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/2341841727.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/vuvuxopanifakizamib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/bugemafuniti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/kodadafepidokovapitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/xetuwudupumadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/fezubadavevol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/430363369.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_off000061b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 5144 bytes
SHA-256: d8694e4880d9be2a40df2a8e8617d739aa85027e2dc1863c6a1ebc59a0c3124f
font_01_sfnt_off0000733f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733F 9992 bytes
SHA-256: 98debe2945c5a915e1ea5abf01600c521bb7b3f67ed8c537099460f4ff24040e

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