Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c9903451a8debf…

MALICIOUS

PDF

38.0 KB Created: 2020-10-25 18:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 44a58ecc595205c6b6c7b28ef11ab43c SHA-1: 8e4cb517a6aa9d87db167b9670a7e9f190daff11 SHA-256: 13c9903451a8debfdba61b7656619c5200d5c5edd6338030c8b64e47f0936340
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many of which are part of a link farm designed to improve search engine rankings. One prominent link, disguised as a tutorial, redirects to malicious infrastructure at ggtraff.ru. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests an attempt to direct users to potentially harmful content.

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/aws?keyword=autodesk+maya+2017+tutorials+for+beginners+pdf In PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/2360056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f9106ec7c037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f86f9578ae20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_5f92174d488ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f8fc872b614e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f95152562f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f8ad5fa8582d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5f933ff202d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8e5658cb904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f87234da0088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3456050b-0934-4456-94ca-3ebebda7332d/bafizuruxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d22966-c667-4e2a-87e7-df91fb23c5c4/5176724820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c371a5-9f06-4dd8-af90-1fa274170ddd/53165570318.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/majixoxeme.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/85967725058.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/38602659593.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/11294194918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc5a9a0-1042-43c2-9d1a-b289b1656aef/novoseremufatoniwilij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24847637-3086-4101-b589-bca96df0e7ad/tegarosajorexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edca36b-4cd3-49e4-adec-54b0bfb7fac7/nibizigulod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cc8ff4-f6cf-43d3-a236-926cd34e78fb/6442634481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9271cc-0f66-40d9-996f-c3ab182fdf3c/31356868088.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_off00005423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 6064 bytes
SHA-256: 32abb59830bcdc858aa504ea59c3a44450ef137fc114905803e53a6581bcf86d
font_01_sfnt_off000068ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BA 9496 bytes
SHA-256: 6aa83ff04311a71a2068ce193693737a7d072ab15379fd338ddc4a149a8819a5

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