Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8e725f09441f69…

MALICIOUS

PDF

35.4 KB Created: 2020-08-22 08:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ba96dab92936e5ea9103385d541a9ebf SHA-1: 46165b1a27f4ff7403ca18853a7d6bc5e6fc33db SHA-256: 8b8e725f09441f691e4a16b9357c5da20b6402b081ae94b5a32611cfae44ee90
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a worksheet and the malicious URL, suggesting a lure. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves redirecting the user to malicious infrastructure via a seemingly benign document.

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.ru/pify?keyword=prefix+and+suffix+worksheet+year+6 In PDF document text
    • http://rovoxelig.splashsteamboat.org/uploads/1/3/1/4/131453526/fipesoja.pdfIn PDF document text
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdfIn PDF document text
    • http://kiwid.torquemetals.com/uploads/1/3/2/7/132711947/2983849.pdfIn PDF document text
    • http://titabanu.drscollection.com/uploads/1/3/1/3/131380485/dazugavido.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/1/0432/9986/4734/files/juruxavenusofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/nurobififupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/28587040718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/mezobidepirazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musuvagexas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/rijisomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/45372316815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/lovujezezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/28869292941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/galazivogunuro.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 8

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_off00004c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4C 5444 bytes
SHA-256: 05ef97d56661aa0793b19ec194746cab72b3d0f8212d23b8a3a194caa7b71b28
font_01_sfnt_off00005ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE4 9948 bytes
SHA-256: 11d898f98073a26d41d6bd1070a12bb5a0791c39e85894f1059c1518b74bea1a

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