Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7e2177437b3663…

MALICIOUS

PDF

48.8 KB Created: 2020-09-12 20:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bb61e1496eacd1bc4027965151d8669b SHA-1: 8de707196674244a2776337b52518972d046d668 SHA-256: ef7e2177437b3663117197ee438eb22f8346df0c730e98a9b665653727969207
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'earth science regents answer key'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector is likely social engineering via a malicious link embedded within the 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.me/pify?keyword=june+2016+earth+science+regents+answer+key In PDF document text
    • http://files.warrenmottboosters.com/uploads/1/3/0/8/130814308/1811736.pdfIn PDF document text
    • http://files.ptutoysandmore.net/uploads/1/3/1/6/131637014/6143398.pdfIn PDF document text
    • http://files.wrightseaplanebaseinc.org/uploads/1/3/0/7/130739835/gatip.pdfIn PDF document text
    • http://zesibobo.drcarolineclarke.com/uploads/1/3/1/8/131857334/a39dc3f1.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/1/0435/0240/3750/files/whirlpool_dishwasher_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/greenhouse_monitoring_and_control_system_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/fevatis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6872/6171/files/sisopibod.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2d1648_4cc0854e2fa04688a38adcf972c1fda4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a081cd24809f4b428fd79204165641de.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_bfb518c5d59a49098f26597b10d0cccc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6e13d9_0e3a1458e57a412e9567e603831dc98a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3bca44_1d187cfa7bcd445bbff97f593306ae67.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00006015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5756 bytes
SHA-256: 40b62e1ffe5f5a137a7b29610568ddc24bf03aa1a1d4dcc77514bca6919f748c
font_01_sfnt_off000073cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 14648 bytes
SHA-256: 0fde41e215b8d250d7f6c5772720442049d0290699e2e4463b855bcc7f891a56
font_02_sfnt_off0000a112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA112 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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