Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1991f729ec8ea4…

MALICIOUS

PDF

59.6 KB Created: 2020-08-21 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 68cdb01e51cb5fff92bc6dd40b6a7d56 SHA-1: 64f884b8f76771bf89eb3276eabb1169e1b9d8cd SHA-256: 4b1991f729ec8ea45d4b9ac774406efb2664b9196f23b1052379e59e960983c1
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=que+es+el+aprendizaje+visual+pdf'. This indicates the document's primary purpose is to trick the user into visiting a malicious site. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute the malicious redirector. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence for the attack pattern.

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=que+es+el+aprendizaje+visual+pdf In PDF document text
    • http://nobezan.royalqueendom.com/uploads/1/3/1/4/131453512/401ae3b2dda217.pdfIn PDF document text
    • http://files.michelleporcelli.com/uploads/1/3/0/8/130814397/jugugul.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/1/0436/5893/6473/files/xiwigunatajavemexonituzot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/43835803611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/bikupinuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/nijozik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/71915073994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/driver_microsoft_bluetooth_enumerator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/xebavemikenovisajige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6133/8531/files/62215116337.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 4

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_off0000acde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDE 5284 bytes
SHA-256: adfe1c6e72d7fc65bce1f464de3bf6fadbfa537e2f06ddc1d124be956087275c
font_01_sfnt_off0000befa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFA 10640 bytes
SHA-256: cee83bf0acabc123a59d6c525c66ac0c4eab80cd11cc1ff562644dd885f226f8

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