Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60b9e7374389ce9…

MALICIOUS

PDF

45.6 KB Created: 2020-11-09 16:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b8797c5e7dd44c885555446e7f9a6dae SHA-1: be782cabf2e21d63f2bdaf5322dafc664964d759 SHA-256: b60b9e7374389ce9ecf4cb1700edefe14f698bc61a77458247a45dddfa471472
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector and others forming a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content or engage in SEO poisoning tactics.

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://traffine.ru/aws?keyword=systems+elimination+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f873f96ccd98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8a93c8c5e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f877760b8ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f94c92c993c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8d66da996b3.pdfIn PDF document text
    • https://lumifuwuzuzeb.weebly.com/uploads/1/3/4/6/134698668/pizajadivexoketolego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f92514c45db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5fa6da6298630.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/felasorarabipis/urolithiasis_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe5d19f-11f1-4e81-ae9c-6067c8b8d639/62929786841.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/bewun.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/a_rose_for_emily_southern_gothic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbf6152-c0e8-4dff-9e99-bbcddef84129/pakobozadotewowobako.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFD 5284 bytes
SHA-256: a343b8be506e34c70488e89881be872cc9493ecfe8d93ca8ed0d69b10a5bfc48
font_01_sfnt_off00006ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 11556 bytes
SHA-256: 53876a485b58e3520d0d0fd240ca1e66f3f2d084d70cc021d49deda05d6bee1e
font_02_sfnt_off000094c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C5 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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