Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec524afb95e60de…

MALICIOUS

PDF

41.8 KB Created: 2020-09-29 18:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 013a919586ca06b6a94141dee520496e SHA-1: 350c614013cc9477b98463f07804bfe5a4b8a171 SHA-256: 9ec524afb95e60deffb2f18ca8122eab3fef9b6a148b0953da23ab83186f6a5f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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=frog+and+toad+the+list+pdf In PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/2382398569.pdfIn PDF document text
    • https://site-1036735.mozfiles.com/files/1036735/21694314968.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/zovasefupusapidusetonud.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/nijimefevitexa.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/1/0432/3144/5156/files/vijideweda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0762/2550/files/who_answers_the_three_economic_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a268fdc0-d429-4474-88ec-a74390d9e27d/fenuwobejozip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa660577-7e93-44c1-9ea0-2536c7d53832/69896450572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4899b4d8-3b14-4357-9882-f9404e4d52b6/93515034308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39934d59-fec4-49eb-8758-c1608f5d5a49/48279595313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a826f68d-2ffd-43ee-8214-818d4bdec30a/49022036434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bb2487-e459-4ff3-945f-bee447e5b8d9/xotesirawegemuxogeliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832e91fc-eba2-4fb4-b28a-30ea248c1600/fomozumaxezunakibadorew.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_off000066a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A2 5256 bytes
SHA-256: d1a595a32d3b70a59be4672e01f32ee6d9d647f664e9ffed5e67e2d191ab586b
font_01_sfnt_off00007884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 9992 bytes
SHA-256: 9c5eb1697b9950c745c1410f5551161435264230047d050ab3f256b24b6a96cd

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