Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc63bd5cf57174e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-23 03:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8c033f3f6d2e5d34a3582795b2960908 SHA-1: 9519602d89bb9d9f6690069f4f705d702f6ce72a SHA-256: ebc63bd5cf57174ea2ce534f2da0aef501e9e05d007ac5eee9ca90f00823a3a5
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'compound inequalities word problems and answers' and the URL for the malicious redirector. This suggests a social engineering attempt to drive traffic to malicious infrastructure, likely for further exploitation or credential harvesting. The presence of multiple links to external PDFs, some hosted on Shopify, indicates a link farm strategy to obscure the malicious destination.

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=compound+inequalities+word+problems+and+answers In PDF document text
    • http://files.keikosensei.com/uploads/1/3/0/7/130739163/2019827.pdfIn PDF document text
    • http://files.desmidtbuilders.com/uploads/1/3/0/7/130739330/3274354.pdfIn PDF document text
    • http://binutak.honeybadgerred.com/uploads/1/3/2/8/132814930/xajuxe-kixot.pdfIn PDF document text
    • http://files.myvbbc.org/uploads/1/3/1/6/131637853/tizeb-ganesawanugeje-fekusav-nujevobesoto.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/1/0431/3006/0955/files/gigoluwato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0531/2163/files/contending_economic_theories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8040/8474/files/7131099301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/lrs-_100-_24_meanwell_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/49874077636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/2574033472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/5421/9683/files/zikowudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7234/8579/files/60729806684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/gabevawerupuvefiraretuz.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
🗂 Part of campaign: desmidtbuilders.com 8 samples

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_off00006776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 5368 bytes
SHA-256: 2eb353f44943ae251bbec385a69a074cf3b2159b26df0ecc4310dec0836c8a86
font_01_sfnt_off0000799a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799A 16268 bytes
SHA-256: 4993d46dc1df798182de30930a608582dfc8ccc595d4e496b3c17d7c4581f48b
font_02_sfnt_off0000acdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDD 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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