Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26f0a317bbb0f52…

MALICIOUS

PDF

43.9 KB Created: 2020-10-20 18:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7dbe186223ce80e567bb61162ddfab44 SHA-1: 3d383f3e6d51c62ece108dd5aed21324f14b3883 SHA-256: e26f0a317bbb0f52fa408d8186323215800be1b7dd4f688f5f65541f9a3a1783
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, a technique often used for SEO poisoning to manipulate search engine rankings. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful 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://ggtraff.ru/123?keyword=advantages+and+disadvantages+of+secant+method+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f888cd0e0e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f89c7f32b6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f8efa818f183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f898a00d565a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5f8e7a862c16a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8ee14c7ec80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5f8eb458e20e5.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/5562614.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/fokisitodidugu-nijebesudavit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f873491b9a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8e3cfc0910e.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/sugaguxagu/barixunesawaturiwafumeka.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/nifitesapetepofu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/nigosegekibasu.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gisesot.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/18744329387.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/8627127801.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_off00006c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 5492 bytes
SHA-256: d123e1b0171eca9e08b2c5c0c19b5a04598000c11167b4eba6774f024a57a064
font_01_sfnt_off00007f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F27 10124 bytes
SHA-256: fecaa6a6a3901e8ed980d42f2d0c243d2869011943411e4852cceeaadce0ed6c

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