Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c543379aab09c2b…

MALICIOUS

PDF

49.8 KB Created: 2020-07-19 11:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 731239150207723273eda3efd8b614d3 SHA-1: 6803639ab9e7143e2ffb3305e08e86c38f6b4e7c SHA-256: 1c543379aab09c2b077aef3bd5b9cce24089878eaad47e5803988b19b6fa0d00
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to mimic search engine results, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'minerals and rocks worksheet answer key', suggesting a lure to trick users into clicking the malicious link. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=13.1+minerals+and+rocks+worksheet+answer+key In PDF document text
    • http://files.drjessica.ca/uploads/1/3/1/4/131438293/winutoka_gowelerujoka.pdfIn PDF document text
    • http://files.aspectcareers.com/uploads/1/3/0/9/130969480/niguge.pdfIn PDF document text
    • http://files.manpatools.com/uploads/1/3/1/4/131406735/jijiwakarok.pdfIn PDF document text
    • http://files.aliciaallenphotography.com/uploads/1/3/2/6/132695493/9896495d62b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sesefami.files.wordpress.com/2020/07/nafib.pdfIn PDF document text
    • https://gowunexinelo.files.wordpress.com/2020/06/37245683771.pdfIn PDF document text
    • https://wuxewaxijij.files.wordpress.com/2020/06/wevevuwitu.pdfIn PDF document text
    • https://kigizog234742658.files.wordpress.com/2020/07/nekoke.pdfIn PDF document text
    • https://zekofanakem.files.wordpress.com/2020/06/sosavokiv.pdfIn PDF document text
    • https://vosameruki.files.wordpress.com/2020/07/jigir.pdfIn PDF document text
    • https://lokefisu.files.wordpress.com/2020/07/vesitinolukif.pdfIn PDF document text
    • https://lipozukot127920867.files.wordpress.com/2020/07/22026825785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7871/2472/files/44152125892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/dudivesusazezewepotekiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/pabafumofovulim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3800/6686/files/48688341246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7111/0308/files/widuxipezupoxumogovigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/89843726396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/jigesabufusenekujev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/41128753497.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 5376 bytes
SHA-256: 5ec6eb54026bbe4b143cdc8396601efcc8e4d0cefe2cea054434b5a451ea3eb8
font_01_sfnt_off00009683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9683 10104 bytes
SHA-256: 28c245efdf80031403bbf02dfaefe727f9bed7b58520fb8586593c0036c49fee