Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2843e60cbd92a69…

MALICIOUS

PDF

44.0 KB Created: 2020-11-05 08:38:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a8b9224cb22df807bff1c9c4cd737be7 SHA-1: 17f385a438070f4d70253aeebda1af709dc78e08 SHA-256: b2843e60cbd92a69cb3fcc031a324a2fb65cd85722d597dddfb51b11d1e197a9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the heuristic PDF_SEO_LINK_FARM indicating a large number of external links, likely for SEO spam or to redirect users to malicious sites. One such link, https://gettraff.ru/aws?keyword=mixplorer+apk+paid, is flagged as malicious by redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the attack by hosting these links.

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://gettraff.ru/aws?keyword=mixplorer+apk+paid In PDF document text
    • https://lixetilox.weebly.com/uploads/1/3/4/3/134390203/wuxugu.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/korolo.pdfIn PDF document text
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/be50c1dbe.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/pasex.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/9d7e87.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/bigoxinit.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/9776964.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/1/0499/7749/1618/files/lutronic_clarity_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/vobodoxojavafuvabobibi.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/citizenship_and_the_constitution_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/30930661299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6109/9675/files/19841576820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20341424-29da-4633-bba7-5918d87315bc/37724663362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1756814d-9b5d-47c0-926e-2d42d68fb0dd/12059172787.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/all_minister_of_india_file.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/zofomokek.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/pattern_symbols_worksheet.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_off000067ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 4912 bytes
SHA-256: a96c4d560966bdf21317c4ee90f659506cf51edf86b083aead61b86942f7f03e
font_01_sfnt_off000078ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BA 13516 bytes
SHA-256: 1455b13172d6a47f04464ac7761c39ad059bdfd7d94cddf271c647bf740a0e31

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