Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1b1d01aa4b935c…

MALICIOUS

PDF

39.0 KB Created: 2020-08-20 06:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 503c862bfbf7f75fa92adac52941cdbe SHA-1: a57e05f667414573c55fc8c8b8665384c704a18c SHA-256: 6b1b1d01aa4b935c56d873cb6bdad683c8c58ef905c3c7bb6a5662ebc868de2c
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating they lead to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of a large number of external PDF links suggests an attempt to create a link farm or distribute further malicious content.

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=invertebrate+vs+vertebrate+worksheet In PDF document text
    • http://files.thenavigatorprogram.org/uploads/1/3/1/6/131607635/cecdf3384d7c.pdfIn PDF document text
    • http://files.heartcraftpaper.com/uploads/1/3/2/6/132682471/984e3a2018602f1.pdfIn PDF document text
    • http://files.krmcloughlin.com/uploads/1/3/2/8/132814168/kazujazezug_vasow_kifopikujax_basapudarolijij.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/1/0433/4059/5352/files/lavepisolona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/tubokuvopekewokadipikiwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/synaptic_plasticity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2632/4383/files/23809407910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/agonistas_b2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/13351046974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0603/6899/files/inequality_graphs_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1828/7266/files/1999_chevy_tracker_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/41686500047.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/49967681519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/functions_of_modal_auxiliary_verbs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/5208/4898/files/type_of_lists.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5332/6241/files/adobe_audition_for_pc_windows_10.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 6

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_off00005b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B28 5036 bytes
SHA-256: 45bc633cb20916b03d451ca7b786be27fa29e2fc40348bae23713a34742e52a6
font_01_sfnt_off00006c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 10212 bytes
SHA-256: 5f293e25c977aef01e1bb7397a27d7151aae82f192f13e5547d2f018714442ef

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