Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cfa2bfa8fff3ba…

MALICIOUS

PDF

63.6 KB Created: 2020-08-18 17:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b6732b300ce7e991ffe05a9c109897f5 SHA-1: 29a1a40e54ee3bef3f08a32166fa31bdc01e4b47 SHA-256: 73cfa2bfa8fff3bae1295d23f97e667992f6a98abddc106075a576ec2018ba5f
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector and part of an SEO link farm. The embedded URL `https://ttraff.cc/pify?keyword=binomische+formeln+rechner+mit+br%25C3%25BCchen` is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to binomial formulas and the redirector URL, suggesting a lure for users to click through to malicious content. The presence of numerous external links, many pointing to Shopify PDFs, further supports the link farm and SEO manipulation aspect.

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.cc/pify?keyword=binomische+formeln+rechner+mit+br%25C3%25BCchen In PDF document text
    • http://files.mariebanville.ca/uploads/1/3/2/6/132683142/jusinuled.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/1/0437/7614/7607/files/nh_dealer_portal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2123/6381/files/69505999369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0399/2474/files/46401566234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/alleluia_canon_mozart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/22581689671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/12358602225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7684/4694/files/employee_resignation_letter_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/poradusukuvufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3683/3952/files/python_selenium_xpath.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/97606312582.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA08E 5220 bytes
SHA-256: 4d76008045a3e83417b2f19a247eda02190049498045b596d3a3d5a037ee77f9
font_01_sfnt_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 11836 bytes
SHA-256: 182e161721fc598de5af9ebe255ad2610d8a5e5cbd47355870243ff4222c2389
font_02_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16364 bytes
SHA-256: 7ee4b1f8d9baa48174a8df6ee251e4312313c21b6030654781c657e16f36b2b8

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