Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a37a994d8a56dc…

MALICIOUS

PDF

48.5 KB Created: 2020-08-14 16:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5519fb46125a35a66dcf651d46876efd SHA-1: c7a4e7c06f2a261bf4b0ab75424438dcf0d91f66 SHA-256: 05a37a994d8a56dc065a9ee82f34b07631aa75942a0053ca71555a8d8f8de93f
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a SEO-based lure for 'calibre free windows 7'. The ML classifier strongly indicates maliciousness, and the presence of redirector links confirms a malicious intent to lead the user to 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=calibre++free+windows+7 In PDF document text
    • http://files.youngconservationists.org/uploads/1/3/2/6/132680870/lukewowesenipuzobixe.pdfIn PDF document text
    • http://vufiwivax.railyardapothecary.com/uploads/1/3/2/8/132814930/7353191.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/1/0427/7318/4678/files/besonumapazenanim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/44392347671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/39616225522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/noes_bsicas_de_mecnica_automotiva_senai.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/85865003929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/64519339364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/geometry_g_reflections_worksheet_2_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/gexirovurebimogegosuweli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/lutozezafevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/14492585814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/2346271061.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 1

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_off00007faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAF 5120 bytes
SHA-256: eef1b267b6c42e3413d095424bec443ca6590cfed3dd69c50c2b38f938b54647
font_01_sfnt_off0000913c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913C 10992 bytes
SHA-256: 02fb33da57fa4f81c2fa9732331f33f7cdf4c6c292df46c6587bb23f307f332b

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