Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b1a824b36f1b14…

MALICIOUS

PDF

62.6 KB Created: 2020-08-15 06:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0bb4241985dc7024a98b4248a1f1a9be SHA-1: 3172e727c5ca0c7677913b098224a11d5405150b SHA-256: 78b1a824b36f1b14f0dcf9ab702d893a5fd68351f93f884102a1701bb2421f85
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to a malicious infrastructure, identified as a link farm for SEO manipulation. The document body, though heavily obfuscated, contains text related to an "Equal arm balance worksheet" and a URL that is also present in the heuristics. This suggests a phishing or scam attempt using a lure document to drive traffic to malicious sites.

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=equal+arm+balance+worksheet In PDF document text
    • http://files.internationaldmd.com/uploads/1/3/1/4/131437453/a96cd01fd22d86.pdfIn PDF document text
    • http://files.vterryscience.com/uploads/1/3/1/3/131380841/8410fee2806a3.pdfIn PDF document text
    • http://files.writinginkc.com/uploads/1/3/1/3/131398145/zajufuxenule-rawetonobe-kasakuz.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/1/0446/9365/1610/files/voxik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/kigugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/8836342146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/audio_books_in_marathi_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8452/9310/files/mepenekeseva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/clicks_catalogue_august_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/26233834174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/48390276139.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/43257055435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/pexemegekevisi.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 5

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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 5416 bytes
SHA-256: 38ad9a0fb50745cd57de7027e0f6052504bd0ed22ecd5e947786b7365032f4e8
font_01_sfnt_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 10364 bytes
SHA-256: 8dc34ea8aa4197878b4b1e5d995efd65541564495c536016a18fa9ab5e72e4f3

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