Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87aa279511e12d4…

MALICIOUS

PDF

47.2 KB Created: 2020-08-25 15:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ea9e2ce8af911788bdf5150795d3f0e4 SHA-1: b4133aeacc2713eb183637ecccbd355861b22571 SHA-256: c87aa279511e12d442aecdc378ae8684902b2f3d64e520c0e422c5560e31b49c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to 'ttraff.com', a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=behringer+ada8200+microphone+preamp+manual In PDF document text
    • http://files.kohchangdiscovery.com/uploads/1/3/0/7/130775649/678d727d.pdfIn PDF document text
    • http://files.hemlockgroveumc.org/uploads/1/3/0/7/130775429/mupagatuw.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/1/0459/9676/9437/files/batusibadedimerepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7609/1045/files/books_to_read_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/jexeselijixabinumes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/wadeful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/58163204753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/graphic_organizer_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/belajar_investasi_saham.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/the_anointing_of_the_holy_spirit_by_tan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/jofefulotun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/duruwezuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/analysis_essay_sample_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/facebook_login_logout_button.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_off000078b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 5828 bytes
SHA-256: 8fb2af9f6e40e01515ede4b08b9152c81b72c9ea19f840215433c9e2b38572fc
font_01_sfnt_off00008c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C53 10480 bytes
SHA-256: 4688aee4a67e5193ffd7e0425526c62228f79ecc4cc87d9e782386d4be2f1255

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