Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4dfad97e3f8c84…

MALICIOUS

PDF

38.9 KB Created: 2020-08-06 22:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 664c7e04ad8f8adeb13226612c1c97dd SHA-1: ebcc5d74d89c0efe4e1423e8deb8a65deec7fe31 SHA-256: 8b4dfad97e3f8c84d1bd24dbc87c3054c51eb7e3aadb5a1fbf76833ea8f609f8
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 external resources disguised as textbook downloads. The primary URL, 'https://ttraff.cc/pify?keyword=download+idodo+umeh+college+biology+textbook+pdf', is identified as a malicious redirector, indicating an attempt to lead the user to harmful content. The presence of a link farm further supports the malicious intent by attempting to obscure the true destination and potentially leverage SEO tactics for distribution.

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.cc/pify?keyword=download+idodo+umeh+college+biology+textbook+pdf In PDF document text
    • http://files.spotlitekustomaccessories.com/uploads/1/3/1/4/131438150/rabozidusag.pdfIn PDF document text
    • http://files.michaelenglandart.com/uploads/1/3/0/8/130814297/8215447.pdfIn PDF document text
    • http://files.bowenheritage.org/uploads/1/3/0/7/130739308/1934782.pdfIn PDF document text
    • http://files.riverqueengreens.com/uploads/1/3/0/7/130775320/wakumasawewasol.pdfIn PDF document text
    • http://fifef.gtgsplash.com/uploads/1/3/0/7/130775823/dazimamudideni_xapisifafuf.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/1/0429/1634/8057/files/nevumurewoganolexeji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7862/3138/files/jafub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/clicker_heros_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/kadogagalatofejuxotebum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/28480719847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/41041167021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1193/8216/files/18445392979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/9367236934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/15327425248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/kuguxolal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/93970459645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/folezovadelige.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5658 5760 bytes
SHA-256: 5385b2ab126e9cb1c07b34e96a027b2c6b0c007fefbf6abfe3773ca1efb08fe0
font_01_sfnt_off000069f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F9 10068 bytes
SHA-256: 6d936d1f1d7d817769daa8373f43261a34008df731ae0049d4c900499258325a