Malicious PDF — malware analysis report

Static analysis result for SHA-256 87356bc8ec61a390…

MALICIOUS

PDF

42.9 KB Created: 2020-08-02 01:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 12d94cec3f8e17fdcc4c3e066ce45d8b SHA-1: 24ca1427bd2131bf854bacd05bbc2099f6d8eba4 SHA-256: 87356bc8ec61a39015d7e2209c2b6b3cb00e3eb91684ebf5fb119d3821b6f8cb
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with the promise of "June 2017 geometry regents answers". The ML classifier strongly indicates maliciousness, and the presence of numerous links to external PDFs, many of which are benign, suggests a link farm used to obscure the malicious redirector. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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.ru/pify?keyword=june+2017+geometry+regents+answers In PDF document text
    • http://files.justinbarwick.com/uploads/1/3/1/4/131452922/madidugivojo-morosu-tulomobosidumog-tojubuxajalol.pdfIn PDF document text
    • http://files.fullwavemusic.com/uploads/1/3/1/4/131483249/lewufuf_gulidarasosufa.pdfIn PDF document text
    • http://files.urjcmunnews.com/uploads/1/3/0/8/130814329/noxola.pdfIn PDF document text
    • http://files.pgmbcstl.org/uploads/1/3/0/8/130874496/6839312.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/1/0434/5918/2745/files/circle_with_a_dot_in_the_middle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/98370768012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/89442437606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/lidatipemidoxat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/94839821642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/xirebewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9187/7283/files/bisupinenegerasilef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/balevogigadan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/gixefipasojuropemu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/skins_stealer_for_minecraft.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 3

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_off00006916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6916 5560 bytes
SHA-256: 89e5b4965c1ef5e2c5142dca2cb5ac85e22be5ae60cbaa1c4d4666fc37f48d1d
font_01_sfnt_off00007c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 10312 bytes
SHA-256: 25683d163e26cf0c197d1d5b4b59a1ce55dd8f4af60c2402ad3f8060cbab7d94

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