Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c98f5145b4acf35…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 09:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 419bf7b1289e2b16c350fef9ebcf6621 SHA-1: e8d5b06972e32b7310fea00e066853a616619779 SHA-256: 0c98f5145b4acf3573c3ad32f16334ef87858ee6d5f0a47b20b1cd1d005d70a1
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, many of which are hosted on Shopify and appear to be part of an SEO link farm. One prominent URL, 'https://ttraff.ru/pify?keyword=windows+server+2019+cal+licensing+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users seeking information on Windows Server licensing. The ML classifier strongly indicates 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/pify?keyword=windows+server+2019+cal+licensing+guide In PDF document text
    • http://files.keaolono.com/uploads/1/3/2/6/132682230/ea34bd430.pdfIn PDF document text
    • http://files.penascodelsolhotel.com/uploads/1/3/1/8/131872105/3376821.pdfIn PDF document text
    • http://files.casadedios.us/uploads/1/3/2/7/132740778/zejasigogu.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/1/0434/1468/3813/files/27389244448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/zagaxukazesulapisul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/giduzop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1334/9273/files/31998368490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/numerologia_tantrica_kundalini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/74221345588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/21709275159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/kuzujafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/stirling_lloyd_bridgemaster_data_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3577/0532/files/garasonoputefo.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_off0000672a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5752 bytes
SHA-256: 95331e77a0b86d088af35ec1f28b9a6220a107bfcb18665f83011f35315d2956
font_01_sfnt_off00007aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEB 13640 bytes
SHA-256: 09d37d4cfb5f932f44105336155de30f853e7518f26f93bba1b9811dd0ff2673

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