Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb1d63a6fc8a499…

MALICIOUS

PDF

40.5 KB Created: 2020-08-12 01:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c0dc1ac9e3fba0492ef73b4252fdba0f SHA-1: affde78bac5a94680eff3414239867ac492619ef SHA-256: efb1d63a6fc8a4998fd79e0fb1d6e989c4b0bde5f841435d7c5790f9460eecad
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that appears to be part of a link farm designed to lure users with search engine optimized PDF download lures. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for further malicious activity.

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/wb?keyword=antenna%20theory%20balanis%20pdf%20download In PDF document text
    • http://files.getgobsmacked.com/uploads/1/3/1/4/131453674/e3674.pdfIn PDF document text
    • http://files.springvillebaseball.com/uploads/1/3/1/1/131163878/4542659.pdfIn PDF document text
    • http://files.rhsmorningshow.org/uploads/1/3/1/1/131164387/winaraguzaride_gikagufit_zofev_lukopemegaduju.pdfIn PDF document text
    • http://gojeko.sbtopics.com/uploads/1/3/2/8/132814074/bezij.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/1/0429/5560/4121/files/molibom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/zebra_barcode_printer_gk420t.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/tracheostomy_nursing_care.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/dozexojikaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7606/6211/files/jozamuvitunikuvivalowuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9137/7828/files/buvewalako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/mental_abacus_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7178/9470/files/49438403898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6160/4505/files/zoo_tycoon_complete_collection_download_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/73719151724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/shopify_trust_badges.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5625 5452 bytes
SHA-256: 51b1ba82a11ba7f51e61f57bff4d76148dc65079f00584e6974a3bedb263fce1
font_01_sfnt_off000068aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AA 2116 bytes
SHA-256: 3d710a4b121cc3492c3eb33a949758d423697a96dc6070b99fa40abea3aa876d
font_02_sfnt_off00007275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 9956 bytes
SHA-256: 6e956a6929599b565a62a6dc52b66fe04e55617450c1a9007a7130f0985a3600

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