Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd3ca3076761a94…

MALICIOUS

PDF

44.9 KB Created: 2020-07-08 12:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 8b59d27140fb5ba2279fe7cc66921576 SHA-1: df23b91e51854f81c1cdd1b04ab5b3604a0b1a34 SHA-256: 6cd3ca3076761a941d9ab6dc010a91ad968b5c7f3fb27d85bcdf15d808fa51e3
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, while containing educational keywords, is heavily obfuscated and also contains URLs, suggesting a deceptive attempt to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=multiplying%20and%20dividing%20fractions%206th%20grade%20worksheets In PDF document text
    • http://files.orangehistory.org/uploads/1/3/1/3/131380998/6a7d3c8e67aa6.pdfIn PDF document text
    • http://files.wilkensestate.com/uploads/1/3/1/0/131070379/0c73f9fe.pdfIn PDF document text
    • http://files.ameliesutter.com/uploads/1/3/1/3/131398000/dapiguvebot.pdfIn PDF document text
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdfIn PDF document text
    • http://files.tworiversrecovery.com/uploads/1/3/2/7/132740860/91cf8adff.pdfIn PDF document text
    • http://files.friendsofthelibrary-chattanooga.com/uploads/1/3/0/7/130776481/2416705.pdfIn PDF document text
    • http://files.elimpetaluma.org/uploads/1/3/1/3/131379290/tulixub.pdfIn PDF document text
    • http://files.anammai.com/uploads/1/3/1/0/131071035/pigaxinuwafapow-xuberupawita-lijubudu-fafowoka.pdfIn PDF document text
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdfIn PDF document text
    • http://files.forhisglorydeland.com/uploads/1/3/1/4/131406433/45a52.pdfIn PDF document text
    • http://files.en.icm-basel.ch/uploads/1/3/0/7/130739383/xomepaboxa-pogup-watotijoruzug-xidaboraso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xubutamim.files.wordpress.com/2020/07/dudututa.pdfIn PDF document text
    • https://wisiseju.files.wordpress.com/2020/07/mamodakimijituduxubok.pdfIn PDF document text
    • https://nubamozi.files.wordpress.com/2020/06/fabuzuwepoluf.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 8

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_off00007118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7118 5776 bytes
SHA-256: 296892d1dadcae23fc654811fc225ff6623306fb99535a087eaaf73d2dd17b29
font_01_sfnt_off000084dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DD 10016 bytes
SHA-256: 854ff123def28b0dcf876fc6e8c6370577969d3d407eb85e56b4cb25fed4fcbf

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