Malicious PDF — malware analysis report

Static analysis result for SHA-256 e355c49cc798d140…

MALICIOUS

PDF

47.8 KB Created: 2020-11-04 08:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff4674fade0c47de9c1da7388c25a84 SHA-1: 94108994cb5948877b49abf36b4c265fb878a913 SHA-256: e355c49cc798d140b6324b3e8fd067c7c11d5c4aea5bc96b5ee6d1bd3902be64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, also contains the same URL, suggesting an attempt to trick users into visiting a malicious site under the guise of downloading a free PDF. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=miracle+morning+pdf+free
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5f9477e0280e3.pdf
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/terujunafovivim-dabegowokel-serukedapi.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5f9ec0d814dd4.pdf
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/3533426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/808bfb1e-bc56-45d6-90cf-2c5c63974872/dragon_ball_z_mp4_download.pdf
    • https://s3.amazonaws.com/xabalaru/20508816936.pdf
    • https://uploads.strikinglycdn.com/files/90e34c2e-246f-48df-9ef2-64ea4ebc211f/teluto.pdf
    • https://uploads.strikinglycdn.com/files/d8cd81f0-edf9-4f16-a680-3c6bf0520f4f/61472668913.pdf
    • https://uploads.strikinglycdn.com/files/84b554fe-cc70-43f3-9188-98441bf89817/thank_you_letter_to_doctor_retiring.pdf
    • https://s3.amazonaws.com/pewibim/81175573390.pdf
    • https://uploads.strikinglycdn.com/files/f5955deb-1d92-41e7-b7d9-b925235b84f5/41626984156.pdf
    • https://uploads.strikinglycdn.com/files/c7b16e8c-bd96-4b0a-9011-ecdb4a1a1388/vometu.pdf
    • https://uploads.strikinglycdn.com/files/87057a10-90bb-4e26-917d-691af6439f61/viwavisumomijowawuzowiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d41.bin
6dbee62243bb4cd3271ff6a3e5be161ccdbc21c7be7963ae0a8c6b926b4640b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D41 5300 bytes
font_01_sfnt_off00008f3f.bin
81036f85f66f0e42e30c86dd1fc9a1d6a0a977446c3fd8f5d100beaf3b5887a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3F 10344 bytes