Malicious PDF — malware analysis report

Static analysis result for SHA-256 83af91841a842c57…

MALICIOUS

PDF

35.2 KB Created: 2020-08-10 12:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6c68aadac5357ae7eebf312c0d7a943d SHA-1: 166a1eb9faf2109ade7fdd32ddd1f6b16daa1e1b SHA-256: 83af91841a842c5766d9b5f2cdb0fb845401dd736a20a61df1d7bcdbdbb6d770
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL pointing to malicious infrastructure, indicating an attempt to lead users to a harmful site. The document body, though malformed, contains the same redirector URL and keywords suggesting a lure for free content. The ML classifier strongly supports the malicious nature of this PDF.

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=chacha+chaudhary+comics+in+english+pdf+free In PDF document text
    • http://files.jumpstartpreschoolavon.com/uploads/1/3/0/9/130969452/jonape-jakipusazara-linumil-gesepelemiruz.pdfIn PDF document text
    • http://files.galerianasse.com/uploads/1/3/1/0/131071191/dutetotokubuzufuw.pdfIn PDF document text
    • http://files.create-diy-online.com/uploads/1/3/0/7/130739595/abbcd2f4.pdfIn PDF document text
    • http://files.golden-aquarium.com/uploads/1/3/0/7/130776712/sisivogimizenurulu.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/1/0437/6186/0757/files/what_is_the_abbreviation_for_missouri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/43286259270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4468/3419/files/javojufinoxinuzuxif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/list_of_aerospace_companies_in_bangalore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3810/4985/files/tanatologia_que_es.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/ayushman_bharat_name_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8558/4797/files/2010_volkswagen_jetta_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/fundamentals_of_radiation_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/74647869448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5571/7271/files/candido_portinari_biografia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/witemumub.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_off00004c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C35 5576 bytes
SHA-256: b08ee3495e7b9c2c78ade6d1d2e66f47552e7c6f9360e610108e848b224adb22
font_01_sfnt_off00005f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 9584 bytes
SHA-256: 04ca0a5c24c6065bd83ce4042e945941c0de0fc6419c54ebfe5522707c88446d

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