Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ecb9213685e6f5…

MALICIOUS

PDF

53.1 KB Created: 2020-08-12 12:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86d57c88a61cb23ea7dc8a4e403c3d9d SHA-1: 290d6ae78f2269b8c4c3b8b6e53641f04f4f1c6c SHA-256: 87ecb9213685e6f5b44205bee9dc3344de63a4d7a80864575c38066f20d19a1d
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a redirector URL, which is part of a link farm designed to mimic search results for technical documents. This lure is intended to trick users into clicking the link, potentially leading to credential harvesting or malware download. The ML classifier strongly indicated maliciousness, and the presence of a recovery secret lure further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=asme+section+viii+radiography+acceptance+criteria+pdf In PDF document text
    • http://files.seasidehomedesign.com/uploads/1/3/0/7/130775983/loxido.pdfIn PDF document text
    • http://zeparuga.sallyjaneheit.com/uploads/1/3/1/3/131398140/b76a72b51a08c36.pdfIn PDF document text
    • http://files.villageyogayogi.com/uploads/1/3/0/7/130775768/kokegomeludabefokar.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/1/0430/0495/2735/files/febovevimupuboripurin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/42121507387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/vernier_calipers_reading_practice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8182/files/11419170802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/46487633509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/resezigosuguzokotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/nitrate_powder_7_days_to_die.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/blood_brain_barrier_anatomy_and_physiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/16589443898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9349/0838/files/33384738744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/93142717663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/95360753033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/zasadubedupebika.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_off00008edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 5688 bytes
SHA-256: 53b417cf7f342ac77f81eb9dc2972943bf744942229a770f4f4f28ac99e0cb11
font_01_sfnt_off0000a20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA20A 10772 bytes
SHA-256: e6feb8261f2690b24b67bd6661bc61f3f0ee482ca535d28da313fde74010aa51