Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcdd899e3874dbb…

MALICIOUS

PDF

50.5 KB Created: 2020-08-14 23:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d72dc146ebdf9ab114e517d72189616a SHA-1: ec0652ea3f338e71c6efb0331da5a0894086590b SHA-256: 6bcdd899e3874dbb7112155cacd2ff9a32fdb7bc531ab3588562fd18d8104ae9
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The embedded URL and the document body text, though heavily obfuscated, contain a URL that points to a redirector. This redirector likely serves as a lure for phishing or to download a second-stage payload.

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/wb?keyword=polycistronic%20and%20monocistronic%20rna%20pdf In PDF document text
    • http://files.briorecordings.com/uploads/1/3/2/7/132712139/ruroxamekuvofix-wogofaxus.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/1/0435/0279/6964/files/25128671173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/31545294351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/que_es_el_microscopio_optico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/6765556976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/9789112456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/23023653369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/john_deere_212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/57186042990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/30750364481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/asme_b16_47_series_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/d_alembert_principle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/mazofumetejaniruvoxuride.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/soguxojuminugarokome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/zovesebe.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 2

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_off0000880f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880F 5404 bytes
SHA-256: 230de6c8a32e503f4f3555012ed7632317db8d580f759c939ef910e5ae7de7cd
font_01_sfnt_off00009a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A54 10008 bytes
SHA-256: 0168e3d40d8e06c2c8e23280543b7f8a9f7580c3e2b8eac18185dad1ac8c8b38

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