Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e4a51a3dd39f6…

MALICIOUS

PDF

39.5 KB Created: 2020-08-14 18:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b91ee55fede8ce896c74c1fa68f0947 SHA-1: 67e5ce114f10c40dce46720dd96d4d4b552c303d SHA-256: 1b2e4a51a3dd39f6afe0b939cbf03e3f0c1de271289549867f83cd7b59ae00e9
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to 'binary decimal octal hexadecimal converter' and includes the malicious URL. This suggests a phishing or redirection attack aimed at users seeking conversion tools. The presence of a link farm heuristic further supports the malicious intent of distributing links to potentially harmful sites.

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.com/pify?keyword=binary+decimal+octal+hexadecimal+converter In PDF document text
    • http://vemivisi.teamemfield.com/uploads/1/3/1/6/131637419/tekulufifit.pdfIn PDF document text
    • http://xenabazal.dmrcrafters.com/uploads/1/3/1/1/131164250/85822c5744461.pdfIn PDF document text
    • http://files.joyfulsoundchoir.org/uploads/1/3/1/3/131398377/09ba6a.pdfIn PDF document text
    • http://files.liongroupllc.com/uploads/1/3/1/1/131164250/lodiwetuduj.pdfIn PDF document text
    • http://files.somedaynewfoundlands.com/uploads/1/3/1/4/131454549/bememezaxu.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/1/0434/9971/6770/files/zifud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/tipos_de_aprendizagem_organizacional.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/91125928140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/ramulisoxep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9815/8744/files/vibawuwifivosefinad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/encode_to_base64_js.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/78711285234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/37488017235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4650/8456/files/noughts_and_crosses_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/94677122942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/self_contained_breathing_apparatus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/93803974211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/amantes_para_sempre.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_off00005595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5595 5280 bytes
SHA-256: 9a7b2123b980672cf03cd9570753f7a989576af9456626ab79f9523d4e6c3130
font_01_sfnt_off00006762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 13136 bytes
SHA-256: 347d7b1df1073b17fd9d80eabaf958fad0e85056744e673d01d2aaca09d24301

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