Malicious PDF — malware analysis report

Static analysis result for SHA-256 836c2a159b8b4e88…

MALICIOUS

PDF

39.5 KB Created: 2020-08-15 03:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dc0045347e57fd111c53261536c4b4f6 SHA-1: d38c6dcb346e52fd18a7baea30e3c53f6cb9aa2e SHA-256: 836c2a159b8b4e88ed9510cd6702efb585f6d1bccbe43c2c233043d867caa2b0
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious infrastructure, identified as a redirector for SEO link farming. The document body, though heavily obfuscated, contains text related to 'manual handling training' and includes the malicious URL, suggesting a phishing or scam lure. The ML classifier strongly indicated maliciousness.

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/wb?keyword=manual%20handling%20training%20adelaide%20sa In PDF document text
    • http://kefofubox.cantortradegroup.com/uploads/1/3/2/6/132682076/pozigat_gelozakavitub.pdfIn PDF document text
    • http://files.tommysguitars.com/uploads/1/3/2/6/132695213/8cc78c.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/1/0431/3088/0162/files/budurizejaliwakeze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/39048597844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/modern_periodic_table_of_elements_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/78283663198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/mewijobekimefus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34597476450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/33614048105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5208/9000/files/nalek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/different_types_of_discourse_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/22422345991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/42019672084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/e-_business_strategy.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_off00005c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C87 5092 bytes
SHA-256: 34c89d23ea3ead133d5859a608c7975100056cae2a8b670fb391e089741c4822
font_01_sfnt_off00006dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 10432 bytes
SHA-256: ef3b0098cbf46b65c6c40867b7146e25b71bc7176d91ff87ef142bb7c3023e60

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