Malicious PDF — malware analysis report

Static analysis result for SHA-256 261cf6c1b72ba8ff…

MALICIOUS

PDF

45.1 KB Created: 2020-08-25 13:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4119428793518a540e2927b70612602e SHA-1: 6b3ae769146e6bfc2b81d8fdf33d83f9ed3b2f35 SHA-256: 261cf6c1b72ba8ffa210cf468eeea2cd69d2d1233bea878c3afa2cc7f789b7db
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=mla+format+book+citation+page+numbers In PDF document text
    • http://xoxelixid.kingturkeyday.net/uploads/1/3/1/8/131856161/kanupas.pdfIn PDF document text
    • http://files.ourwordsarepowerful.com/uploads/1/3/1/6/131636562/nanasubevalezabe.pdfIn PDF document text
    • http://files.themusic-shop.com/uploads/1/3/1/3/131381428/nivutudi-rusufimufu-vaxoz.pdfIn PDF document text
    • http://files.achschoral.com/uploads/1/3/0/7/130775055/zikifonumiwiji.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/1/0432/2073/0011/files/7511842568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/martyrdom_of_polycarp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/kepijazabowobowuwada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/nerodetupexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/radiseloduga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/lexunejujofenutopawurasit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/zidevivovezapijakav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4899/2922/files/29826457253.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
🗂 Part of campaign: achschoral.com 4 samples

Related samples 4

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_off00007321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 5544 bytes
SHA-256: 5cd86591d4232c9135df2762a4c1a34305367eb10b6ac405a9149f5e2c5157a9
font_01_sfnt_off000085ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EE 9908 bytes
SHA-256: 2ed9ad87ec3c1d54cca9e8967766928bf13a28e9daf6ae41164154dc422a3ea8

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