Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9c522d66f9505d…

MALICIOUS

PDF

43.4 KB Created: 2020-11-03 20:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ffcbf0ec728781d5b55b7df6ef239b9b SHA-1: 984efbeb742472201093912635d97ef16a4d933d SHA-256: aa9c522d66f9505d25ef7b7d9ba38eda533be961634cfe3cff00fd4e7e64f9f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.link/123?keyword=of+mice+and+men+american+dream+candy In PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/pupepuzitapofevij.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/cf49355.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/9467729.pdfIn PDF document text
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/sibafawelubev.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/ledanuvisonav.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/9f285ebd-3017-473a-98b3-06b4027cf670/btd5_free_download_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f04d87-ce9e-4df7-80f7-1d6a3ec3b8c9/animaciones_y_transiciones_en_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e6dce6-a8b4-48a0-935f-8f0e1f2fdcbc/10896485948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635dd888-ab21-4da5-b8a2-33c80d9164bb/fulodo.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_off00006cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 5084 bytes
SHA-256: 8a1dc2134bc2c11789ddcc6a6cbcde92b4895be9a3cfd7d8e0c376d19ef12ca4
font_01_sfnt_off00007e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3A 10144 bytes
SHA-256: 75ddb431d7858d1e731c5cfdc5b47df62bfe9007952c3e210e4e8be1c54428bf