Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb86e1ad6dad3cf1…

MALICIOUS

PDF

40.7 KB Created: 2020-08-09 00:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 23688ab5d09b4f2897feb899814660ae SHA-1: 88d610463cbd79d9ab63480e815cc9afbdc0db98 SHA-256: fb86e1ad6dad3cf1e30621d803a84acd39a99b32415a116964f450b31fbd1148
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a document about learning disorders. It also functions as a link farm, directing users to numerous other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness, and the presence of multiple external links points to a social engineering tactic to drive traffic to potentially harmful sites.

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=trastornos+de+aprendizaje+definicion+pdf In PDF document text
    • http://files.brisafinancial.com/uploads/1/3/1/0/131069934/semobafet.pdfIn PDF document text
    • http://files.counsellingforliverpool.com/uploads/1/3/1/4/131410479/kinivazojixaw_bebubadobavo_sugozulakoto_lufakabexi.pdfIn PDF document text
    • http://files.labsavvy.org/uploads/1/3/0/8/130814169/7c107b.pdfIn PDF document text
    • http://wikij.musicacollinadoro.com/uploads/1/3/1/4/131408027/pedapusuzevonibekos.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/1/0428/7938/5766/files/pawarasikewuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/the_adventures_of_huckleberry_finn_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54101174921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1917/9944/files/chess_board_setup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/vijisekuvulox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/78623165164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/kofefimimafetukipoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/kiximofeviveruz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/a_thousand_years_chords.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 6

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_off000060e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 5192 bytes
SHA-256: ccec32c9a2a241cd20e19327832ec989e73ffbfa85b8b41293eae78c92408b48
font_01_sfnt_off000072aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 10336 bytes
SHA-256: 8e9438deedeb5de2b82debeb1eceb35fe6209b64f989a170777bde551d6673df

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