Malicious PDF — malware analysis report

Static analysis result for SHA-256 40228407cbfc7407…

MALICIOUS

PDF

48.1 KB Created: 2020-10-25 21:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5a53833971d25c6a484395209713364d SHA-1: 9dfaee1b514503288e534a0cc1e5984b8066d20c SHA-256: 40228407cbfc740756b1c9a6488fa818f4279f64005c376d608ea561d4f70dcb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of links to external PDFs hosted on Weebly, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristics, further supporting the malicious intent.

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/123?keyword=keynote+presentation+app+for+android In PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/35297e63e.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/a1744989aa6d.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/2188696.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/8723704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f890cd6357d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5f8bd1d88e0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f94fa63d2a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8a65c42db5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f95946c09c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8a2f5d0e85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f94565f57c53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/jikoruvagavoginuvapixiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1128eaa-e6ea-415b-88d1-34ae606dc978/wenasuwipojupaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee253f72-a32c-416b-b2f2-1ca27f180bff/jetakiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748f758f-266e-4ffc-90a6-ad4b02bcbc71/84811320884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b62499-6c78-4d4f-82b8-453f93dfd464/61962322027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e9593d-013a-45dd-8ab7-aa4acb6732dc/32006252006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8274c0ed-796a-4179-b79e-449bf1e3bd0b/guess_the_emoji_49.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d010d94b-62e0-4a8c-b8b3-01b6ec327775/87854605313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6aac7f9-68fd-4ac5-b828-f112d0041e59/imaginative_realism_ebook.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_off00007d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9A 5072 bytes
SHA-256: f180f4467175fcc4bf8a403d165643404c7750a8c43861c0fa081490913ab817
font_01_sfnt_off00008ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 10460 bytes
SHA-256: 77b6e3e131f378020f890e3b00af04985417502dc28341b5371bd952eba43348

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