Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab4d25c9cfa1e85…

MALICIOUS

PDF

37.2 KB Created: 2020-08-07 22:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3d75fe981eade26ab2f8979e0a49652b SHA-1: 650ba8bcb601d0b1e0a642d46540b3795805323f SHA-256: 8ab4d25c9cfa1e85d46e9002fa29cb8d5187905c223c5de2e7e50699b845d527
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=bioreactor+system+design+asenjo+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to malicious infrastructure. No scripts were extracted from this sample.

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=bioreactor+system+design+asenjo+pdf In PDF document text
    • http://nafivubag.soundcityreading.com/uploads/1/3/0/8/130813528/d8a0450bb.pdfIn PDF document text
    • http://files.theayalas.com/uploads/1/3/0/7/130776401/kezezevut_zaliw_waruwolasusox_nulefob.pdfIn PDF document text
    • http://files.illinoiscardinalsbaseball.com/uploads/1/3/1/4/131438348/069356a21572.pdfIn PDF document text
    • http://files.avvstaffarea.com/uploads/1/3/0/7/130740053/wuvavapedon_mofedojunuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/jafavamakoravugeginutis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/binary_search_tree_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9504/6824/files/vujibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/contrastive_analysis_james.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/larananiwonezasagopakeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/ode_to_a_nightingale_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/jelefaxapafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/74499535628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/baximizajis.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 7

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_off0000463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x463D 5456 bytes
SHA-256: c6768432600e4aeb63ead697475967ce37f22dda3e16259476c9d66ab926309b
font_01_sfnt_off000058c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58C4 9704 bytes
SHA-256: 3633466e76e4f224acf04c7b9e49fa0e2d18c96e338893dae0d8ef89fe12fe5d
font_02_sfnt_off000079f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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