Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1ad2f0e55ffb78…

MALICIOUS

PDF

37.9 KB Created: 2020-08-21 06:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a672fc3df25f8264fff089d578ee3c93 SHA-1: 24bebd03239cd29f2474b63bc3fbfca82aaf8664 SHA-256: 8b1ad2f0e55ffb785dd3b39d06ce877c9caf3035343308e98c15346ac1503b34
170 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document's primary purpose is to trick users into visiting malicious sites, likely for further exploitation or credential harvesting. The presence of a "download button" heuristic further supports this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=eclipse+oxygen++for+mac+os+sierra In PDF document text
    • http://files.aztecag.com/uploads/1/3/1/4/131453588/4fbcc.pdfIn PDF document text
    • http://files.clarksmithphotography.com/uploads/1/3/0/8/130874204/zadexoxemodifef-golozazubizop-nifemavevug.pdfIn PDF document text
    • http://files.procounseling.org/uploads/1/3/0/7/130738852/nodira-savotifejido-vujasijatosavur-lolib.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/1/0435/5670/0319/files/apics_cpim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/sekoxutivoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/8663440734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/practice_worksheet_graphing_cubic_functions_using_transformations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/27875264973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/67990858223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0706/4734/files/advanced_javascript_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/buxovuvipegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/milogefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/meletajoxefifotowobuvubef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5521 5460 bytes
SHA-256: 31c88e8928cc66a76a63ad7be60e18f36eb13f1bec5b53c36e3b259f2591e59a
font_01_sfnt_off000067af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 10296 bytes
SHA-256: 1992d21cfd579d8145c8caefcfa57ed578a82d040928231b925a90b3b0f46910

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