Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d3dac19d3bce3c…

MALICIOUS

PDF

41.4 KB Created: 2020-10-07 16:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e8dfcf0fd0efc6f6ef6dd14fe791280 SHA-1: 6d18a18942a985bbd59485f3586a215afda7b24c SHA-256: d2d3dac19d3bce3ce06b7985a7b6acd4853a5485f523763982673952537fca80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/pify?keyword=match+up+the+measuring+techniques+worksheet In PDF document text
    • https://site-1039400.mozfiles.com/files/1039400/44051994678.pdfIn PDF document text
    • https://site-1037850.mozfiles.com/files/1037850/jizijoref.pdfIn PDF document text
    • https://site-1043260.mozfiles.com/files/1043260/63473028980.pdfIn PDF document text
    • https://site-1040312.mozfiles.com/files/1040312/48681917476.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/03252ff8-85c0-4716-856d-b318aaa3fb0a/1198690849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701d5468-0136-424b-9885-4e3e852ceee2/tonotavijenujuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/482b7d95-fcf6-4f51-9495-791241223a93/81374388496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4906/9991/files/tv_guide_cedar_rapids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/chapter_8_geometry_test_answers_form_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0137/5650/files/relibulapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1690/3585/files/watch_two_weeks_notice_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8795/3062/files/fetibawavesudanix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0827/9719/files/candid_aligners_review_reddit.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_off0000633b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633B 5600 bytes
SHA-256: 9d8199d17d20080f360e4d533e9eeb06f6c6318da7f876aa60a2a2a132337df1
font_01_sfnt_off0000763b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 10108 bytes
SHA-256: 542b4425b987b800c16efc538594e0d21aeffb6a62161e479558d310de9d6a8f

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