Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c638f283f0121b5…

MALICIOUS

PDF

44.4 KB Created: 2020-08-04 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 513092ecff37fe17450c251cefd98692 SHA-1: 81d85f3c368752bdc211b3cff7a14fa4f4465a9d SHA-256: 6c638f283f0121b529b1d83594560f86515bbb7858137dfc010e9b8befb8f80c
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm or SEO abuse. The document body, though heavily obfuscated, contains a URL that points to a redirector. The primary attack pattern involves luring users with a fake syllabus download to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mg+university+bsc+psychology+syllabus+pdf In PDF document text
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdfIn PDF document text
    • http://files.drifftblog.com/uploads/1/3/0/7/130739810/5636490.pdfIn PDF document text
    • http://files.realestate-investment-australia.com/uploads/1/3/0/8/130813961/1286042.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/1/0438/3630/9666/files/72956860088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/85468594219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/67311475375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/salon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/43760158966.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/38511910091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/60874816064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/sumizimegugeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/managerial_economics_paul_keat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/kindergarten_addition_and_subtraction_worksheets.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_off00006eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 5724 bytes
SHA-256: b623beffd65fbbba4a122abe5c99a905bf6a094fb6e9bce0d562e30576a4e6ac
font_01_sfnt_off00008241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8241 10048 bytes
SHA-256: a88db674f8f9d11765bad18e57d4861d764fda9abc99faee350a5390c67fa4ed

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