Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b4b23634dcf0a2…

MALICIOUS

PDF

58.3 KB Created: 2020-08-12 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7fbc7cc406eb6d14d8694aeb182d1670 SHA-1: c7a10547748914b5edf9efb91bdf42e7c062d0b0 SHA-256: 87b4b23634dcf0a25f95dbafc62796c609c9ba25a2bec7526d513bd40159def3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files hosted on various domains, including a redirector at 'ttraff.com'. This behavior is indicative of an SEO link farm or a phishing lure designed to drive traffic to malicious or deceptive content. The ML classifier also strongly flagged this PDF as malicious.

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=community+ecology+pdf In PDF document text
    • http://kujaf.outsideinstables.com/uploads/1/3/1/4/131482975/c6d9b70.pdfIn PDF document text
    • http://files.thediscoverypoint.com/uploads/1/3/2/6/132682868/5761160.pdfIn PDF document text
    • http://bepomoge.sandstonegoats.com/uploads/1/3/1/3/131380600/dijasobawive.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/1/0430/3942/4663/files/singleton_design_pattern_in_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/migitogowetemilanon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/xiwubomidafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/handbook_of_blood_pressure_measurement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/english_reading_practice_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/tusomexirebuleloparozexav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/takuraburowupex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/bankers_adda_current_affairs_capsule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7590/2363/files/woluviditamawaxafuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/35624302176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/7226773480.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 5

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_off0000a8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 4996 bytes
SHA-256: 2af77c00dcca0ef47e8358fb2eeb35df79c590396c74e1d6b4112ca0537254e3
font_01_sfnt_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 10224 bytes
SHA-256: f568383994be9b95c890969cdd8c647d0385fa45a9b2b61b77f986f7e80ffd78

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