Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41288feb14e3b6…

MALICIOUS

PDF

59.4 KB Created: 2020-10-06 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0933385662b08b0e76969c387d11f7c2 SHA-1: e729fe14fe6472924755b0bad4fe4b7bfe52696c SHA-256: dc41288feb14e3b6beeb7b5ccd9c9e8e620898d43ddbb82ee03df607ff79764f
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm designed to attract traffic. The document body text, though obfuscated, contains a URL that is also flagged as malicious. The primary attack pattern observed is the use of these links to direct users to potentially harmful external sites, likely for phishing or malware distribution.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gettraff.ru/strik?keyword=being+culturally+aware+means+mandated+reporter In PDF document text
    • http://bunel.stthomastheapostleparishmontfortwi.com/uploads/1/3/2/8/132814084/doxaxigisa.pdfIn PDF document text
    • http://files.flyinktattooparlor.com/uploads/1/3/1/1/131164090/waviwubunejipa.pdfIn PDF document text
    • http://files.jacektravels.com/uploads/1/3/0/8/130813779/wufokamu.pdfIn PDF document text
    • http://files.kippysfarm.com/uploads/1/3/1/3/131380814/toreridalad_fibegaji_xobasabe_wozupuxafi.pdfIn PDF document text
    • http://votazak.strokecarelongisland.com/uploads/1/3/2/6/132681352/7d5dc0b70708f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a88f6d6-6ada-4c37-a399-ce67a26822a1/lijomafevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1508e42-7b19-410d-9f89-5b6cd6ec378b/15501794979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41719740-9033-43a1-8f3f-acf6d6471afb/41098553197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66dc92-e358-40cc-b76c-c0cfbf181779/begejozufam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93234000-8b19-4a8c-bdb2-ea0ecc55d319/30685298940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6543dad5-366f-4a8b-abd7-246c647f5175/30845208920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd3b8d1-6284-4153-bde2-dde15c465629/31111362148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de806fd-4060-470b-b259-cf74fc544615/45749000941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ae8ea3-311c-45ef-a069-76a9838ee13e/42964854084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e07b601-e283-4f52-bc58-cf737d9444d2/43174017170.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_off0000a6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C1 5636 bytes
SHA-256: 652d71a6c961defa6bb64e92dd4ef3143cfc631887a2872f7eab9b7fcff42b3d
font_01_sfnt_off0000b9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F3 11816 bytes
SHA-256: a684ceb3de814b53628561a7e331ec91ab6dd4264fae2f2766ce69c11bd6c5aa

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