Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ed3aee2f03eb9…

MALICIOUS

PDF

75.8 KB Created: 2020-10-28 17:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dc2f4624b6c4b75e6166c73cd43574f4 SHA-1: efdb8215541163f38e9ac064ea2842e06c3495f6 SHA-256: 7f3ed3aee2f03eb9c1ce1f072239c143ed762a6f88c0bf55158b5b121c2ebdfd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or potentially part of a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, possibly for phishing or SEO spam.

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=resumen+del+libro+mensaje+para+los+jovenes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f93c8b4874d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f95fdd22df9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f97dcdc536be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f93463a78e7d.pdfIn PDF document text
    • https://zilasemewoxuj.weebly.com/uploads/1/3/4/3/134318224/cadedae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8a8d0700c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f8c581ec15d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f90f01d40994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f951e634a3bf.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/71deea155c4.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/0394242a-278d-4b89-a034-38c911f0fd4a/29359164265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedddf15-0d8a-4e11-88cb-65d03d85c1bb/bokixiselesetor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5013/0331/files/40390907191.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9729/1941/files/still_me_jojo_moyes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0524/8149/files/180_degree_rule_shutter_speed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/52526933530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26099b4d-74f6-44bd-a392-a014ba19c309/72040008974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4842826b-962b-4424-9f4d-53ac5ce7f0ea/815999728.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 5468 bytes
SHA-256: eec401fea3c0d173975a6640f709dddf5df195dc3026cb7ab4d014fab175ab0f
font_01_sfnt_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 2328 bytes
SHA-256: f3ed05505dac6f053a2fa276f2eb37630b7e953b14e772d8872b6a02f0229269
font_02_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 12264 bytes
SHA-256: cdc22c4c16411bf1d70715a893a4e65cb2293245b6f11da6853fd1361026c8ef
font_03_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16912 bytes
SHA-256: 789b5cdd9426d3998ef7eb0707223ec813c352616dfd61fa52bbbbbbf4916eda

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