Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f177a81449b532…

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 01:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6a42ea7ce4c3224091b308f9786a84c0 SHA-1: b791768925da03dee5ce7054a03b7342a3d89922 SHA-256: 61f177a81449b532699369fc6a2883d6bffe3a75e69a287b67ed97517e4351f6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. The primary link directs users to a known malicious redirector infrastructure, suggesting an attempt to lead victims to malicious content. The ML classifier also 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.com/pify?keyword=annals+of+clinical+and+medical+case+reports In PDF document text
    • http://files.devikafernando.com/uploads/1/3/1/1/131164011/gifijipowipi.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/1/0428/6870/3398/files/cyanobacteria_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/tamil_calendar_july_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5637/3670/files/44557896831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/87630065375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/18615785657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/15517717496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/bstc_answer_key_26_may_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/16402263603.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/15154787810.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 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5919 3692 bytes
SHA-256: 0bbf245cdcceb1b3ba7dd474134b1a05cef801f806a4dea3df841026b2d14704
font_01_sfnt_off00006630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 5288 bytes
SHA-256: 561234314d3517e58b4c26033a7dcf0967c2cd9a3ebd0db6a12514e165b88079
font_02_sfnt_off0000780f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 9676 bytes
SHA-256: 58c542e734e5662694260a6b26b9492d76e1741344e93c5515be1474432d2111

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