Malicious PDF — malware analysis report

Static analysis result for SHA-256 c421cb8536c561fc…

MALICIOUS

PDF

45.1 KB Created: 2020-07-28 06:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b7f6e5cdcc89027aa53a4ad5f495f0e1 SHA-1: 50836decfc0cdb7b89f63eae8d7d852f79a27030 SHA-256: c421cb8536c561fca8e7b7547de2c5bbdee85c78f53311b54a23bd6ff8cd749b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links hosted on cdn.shopify.com, suggesting an attempt to broaden distribution or obscure the final destination. The document body, though heavily obfuscated, contains keywords related to 'marriage certificate request form', aligning with the callback phishing lure heuristic which indicates a pretext for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=marriage+certificate+request+form+illinois In PDF document text
    • http://files.santafest.ca/uploads/1/3/0/8/130874380/61e5615.pdfIn PDF document text
    • http://files.lnonyxstudio.com/uploads/1/3/1/4/131453484/jubaxat.pdfIn PDF document text
    • http://files.ericassimmons.com/uploads/1/3/0/7/130739504/sedejametinedo-nimog-vovigogelukaluj.pdfIn PDF document text
    • http://files.0-institute.info/uploads/1/3/1/4/131438353/dikakokiga.pdfIn PDF document text
    • http://files.ahcw.org/uploads/1/3/2/8/132815318/5068064.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/1/0427/9762/9596/files/dekelanapuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/fasebat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6569/5638/files/66154890892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/84870878436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/4913947544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/kiloniwurorisukefipulada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/nujisojabugifibaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/43859691828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/51813578307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/69701086906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/74940319350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8724/1119/files/33392094091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/98423253961.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 5216 bytes
SHA-256: 0d59c15cbd0aaddda82a1dc236c38c85aa5d7d7c23bfd04269aa98f2697d50f3
font_01_sfnt_off00008480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 9988 bytes
SHA-256: 1a5bbc1a9c0a03ce25093eb3bd48c30484e3e2792f6ad08f6ea605374a946060