Malicious PDF — malware analysis report

Static analysis result for SHA-256 210c81e4dc6659e4…

MALICIOUS

PDF

48.8 KB Created: 2020-07-30 23:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a2cc615eedd4496de9e16db1768947e4 SHA-1: 835257c7aedc94b523c44185a67b23fbdbfef55f SHA-256: 210c81e4dc6659e47e69b7bf5515f366784d087cb8cd418ad6b494bafc53f3e4
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, a technique often used to obscure malicious destinations or engage in SEO manipulation. One of the primary links directs to a known malicious redirector, ttraff.ru, which is disguised as a printable calendar. 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=calendario+serie+a+19+20+pdf+da+stampare In PDF document text
    • http://files.cptoffice.com/uploads/1/3/0/7/130739287/6460365.pdfIn PDF document text
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdfIn PDF document text
    • http://files.cozykidsembroidery.com/uploads/1/3/0/7/130775228/7d6c5a24e.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/1/0437/2021/2645/files/wefirizafenomek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7482/8953/files/24787958699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/3765870955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/vawupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/kekaxuvuxajopudegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/53972684861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/62388269468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/kejowopete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/giredesupow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/19174484081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/61347820171.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/mugaji.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_off00007057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7057 5480 bytes
SHA-256: 2c74eed51c32eca5af0b5298ca179d901e4b5c14d1bfbc5b0ee0cf3f6a0b5455
font_01_sfnt_off000082df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DF 16468 bytes
SHA-256: 9f419668e9bc2b89623183001c387064f0cd13210b7a446219349a2cb7d27c85

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