Malicious PDF — malware analysis report

Static analysis result for SHA-256 625006c37fa48806…

MALICIOUS

PDF

46.3 KB Created: 2020-08-18 20:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bd337612083db81abdea8946862b14b7 SHA-1: 118b776c68928983722b0a9eac3c427cc4b7e8b2 SHA-256: 625006c37fa488064f21ebf4104c18eb9eb2127f580522cc639374db182b03a7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links designed to redirect users to a link farm, ultimately leading to malicious infrastructure. The heuristic firings indicate the PDF is a redirector and part of an SEO link farm, likely for phishing or malware distribution. 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=organic+chemistry+vocabulary+pdf In PDF document text
    • http://files.jones106.com/uploads/1/3/0/7/130776386/9618b7f.pdfIn PDF document text
    • http://files.pharmacomedics.com/uploads/1/3/1/8/131857421/91be3a9.pdfIn PDF document text
    • http://zufotada.knikoletaylor.com/uploads/1/3/1/4/131406149/1993786.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/1/0441/2011/3304/files/patofisiologi_avian_influenza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/duke_s_anesthesia_secrets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/nufatapum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3282/9342/files/vudakajomazegadamekaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8510/2237/files/feripopitilidedemajad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/el_ser_humano_biopsicosocial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/power_of_autosuggestion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/0332/7142/files/xbmc_download_for_ipad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 5900 bytes
SHA-256: 512dfef1fcd1b1035de43933eb6820e37f97d5c9f85a8a59d8738873545af252
font_01_sfnt_off00008a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1F 10064 bytes
SHA-256: 456c71005becbcb8f670db1f4dca4dde3d6bec646f08bccfd46af265755c1627

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