Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ce94bec67f19d9…

MALICIOUS

PDF

44.6 KB Created: 2020-10-31 19:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68315f428581f45e4c1ed138df23d755 SHA-1: dcc4917e98875e32dc70ae0b8a9de5bb2b15d81f SHA-256: 39ce94bec67f19d90e0860986d55c49895e1864ead8b616659d90271f3e787b2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for cloud document services like Google Drive. The presence of a malicious redirector URL and the cloud document lure strongly suggest a phishing or redirection attack aimed at compromising users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=insurgent+google+drive
    • https://cdn-cms.f-static.net/uploads/4426682/normal_5f9971ca49462.pdf
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/wagodozageg-zonorasadum.pdf
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5f9d6380b957b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4d7e9c6e-a08b-403a-a6ea-5b0b1f326589/89571980261.pdf
    • https://uploads.strikinglycdn.com/files/b1563226-d7e4-4fe0-8ccd-bf55fa9b47ec/body_system_questions_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/53346ce1-e7ad-4a33-9fb6-f5846cd4fe47/gufixu.pdf
    • https://s3.amazonaws.com/jinabom/rasikavajabirirazifanux.pdf
    • https://uploads.strikinglycdn.com/files/fe154158-0843-4aaa-84e8-f16c93f4cdd1/dabosiwokubuxutotosesis.pdf
    • https://cdn.shopify.com/s/files/1/0500/4689/4240/files/tiguzamuzavigorupid.pdf
    • https://uploads.strikinglycdn.com/files/0c18b405-5371-4d23-9318-1952f4a573ef/56463724851.pdf
    • https://uploads.strikinglycdn.com/files/dcbf4832-3fff-4fc2-b75e-4c7c920fa67c/valisuwipudavi.pdf
    • https://uploads.strikinglycdn.com/files/0b7574e9-e5cb-4577-bda1-f720d036a859/10060627214.pdf
    • https://s3.amazonaws.com/lakadutof/enfermedad_hemolitica_del_recien_nacido_por_incompatibilidad_rh.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654f.bin
342990d5d5e9962f04a73a5aea2c25ce46f324755da3f7eb7a8459293f4bde56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 4660 bytes
font_01_sfnt_off0000752e.bin
2a0d40fd114cd7ac0fa8bdc8714c6a5c395684b096f0174ccd3a7ffc28f4ca0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752E 10040 bytes
font_02_sfnt_off0000979e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979E 4324 bytes

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