Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8feb5dc31e6830…

MALICIOUS

PDF

52.7 KB Created: 2020-08-06 12:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9f23ab74caa9967176ebab084c046735 SHA-1: 9024ff6d917abb5dd6509a18c4adb5e69dc1817e SHA-256: ad8feb5dc31e683048faa8b74a8b8adbfd2521ce845ca5c1be67ffe52104d42b
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate documents, but the primary link redirects to a known malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a SEO spam campaign.

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=arousal%20in%20sport%20psychology%20pdf In PDF document text
    • http://files.ricor.info/uploads/1/3/1/3/131380052/nuxem.pdfIn PDF document text
    • http://files.kidbookreviewer.com/uploads/1/3/1/4/131407111/perit.pdfIn PDF document text
    • http://files.chestervt.gov/uploads/1/3/0/7/130738562/f1ca2849c636.pdfIn PDF document text
    • http://files.ipdga.com/uploads/1/3/2/6/132682171/cc93e95203e.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/1/0432/8531/5744/files/wopakalogilowida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/katuvoputobisolonidimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/david_goggins_can_t_hurt_me_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/98577263118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2544/8615/files/boy_meets_girl_joshua_harris_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/beden_dili_joe_navarro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/how_to_set_up_act_for_ffxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/gaxepitubib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/msc_botany_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/83013763961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/28617187369.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_off0000912a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912A 5508 bytes
SHA-256: c4cc869a1a9587c26a3fe7fad2ed59653995599c5cb9a52f6b531eee21f51d24
font_01_sfnt_off0000a3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E9 9980 bytes
SHA-256: 463407cbaff569a1c07bac4d453430d8b166661a5ab6536634ae3ac9ac29b31e

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