Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fc0a5b70c9d742…

MALICIOUS

PDF

51.9 KB Created: 2020-07-31 13:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 24a6749e89e1408c3f997260c18205e2 SHA-1: a0dea161dbf41ecb78b760ce54a79825fc5de43f SHA-256: 87fc0a5b70c9d742d5a0ef5537d7c0b918d5f0ea7d7802e0942ba5eb1c0a003e
194 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to redirector infrastructure, specifically identified as a malicious redirector by heuristics. The document body, though heavily obfuscated, suggests a lure related to 'Cours portugais brésilien pdf'. The ML classifier strongly indicates maliciousness, and the presence of many external PDF links points towards an SEO-based link farm used for distributing malicious content or phishing.

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.ru/pify?keyword=cours+portugais+br%25C3%25A9silien+pdf In PDF document text
    • http://files.lawofficesofmarkjcarrollpllc.com/uploads/1/3/1/0/131070151/ed40d5.pdfIn PDF document text
    • http://files.therapyandlearningservices.com/uploads/1/3/0/8/130814124/c2a23698c.pdfIn PDF document text
    • http://files.hammellwinealliance.com/uploads/1/3/0/7/130775627/3780453.pdfIn PDF document text
    • http://files.firstpresperry.org/uploads/1/3/2/6/132683111/zogezesepaka.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/1/0434/2362/9477/files/26362303679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sokapujido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/vusafadenafilesug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/42361912365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/27090209316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/jefotoseseramogaral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/92025199710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/84569822148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/bixusitu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/fiwozuwigezevugaxav.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_off0000883b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883B 5396 bytes
SHA-256: 3a2a30970514af3bb2d8a291a5917b8e663808bf89e11c1d081a84d88d359ee0
font_01_sfnt_off00009a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5F 12256 bytes
SHA-256: 0402642934b3596e5b63c5c354676d1ac82e9c282dfd5bc8f1ffaac7fa28d069

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