Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b3b6b9f949714…

MALICIOUS

PDF

39.2 KB Created: 2020-11-07 21:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db117c4158b6e4a1c2f08b9ffbb08772 SHA-1: d4b0b68af3de1c40cb97b621f6e4a76a7c7d33c4 SHA-256: 3f5b3b6b9f949714b0a0c567b741d092e774fb1c087a5fadde1b7dc070ffaca0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, with the primary malicious URL being trafficked through 'traffnew.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?keyword=magrathean+sperm+whale
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f97ecd52130a.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f87f2db7d3fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55ea32a1-df9d-4f9d-a9e4-2a6995aef347/38114772359.pdf
    • https://uploads.strikinglycdn.com/files/09adcec3-9691-45c9-91cd-464f52925556/74251281816.pdf
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdf
    • https://gisivimumoz941229752.files.wordpress.com/2020/11/kapemeri.pdf
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdf
    • https://uploads.strikinglycdn.com/files/72840bbf-46cf-4dae-8bf7-b6179a0c6072/zumowevatorofufufebub.pdf
    • https://uploads.strikinglycdn.com/files/e1a92f98-09f7-499f-98aa-e874efae1421/why_are_firetrucks_red.pdf
    • https://uploads.strikinglycdn.com/files/8a72ec8e-5255-4f60-a41a-52445c430f9a/terakumuxegovobaxofiroma.pdf
    • https://uploads.strikinglycdn.com/files/5945b176-f0cc-4321-956e-63998667ff3b/om_symbol_meaning_and_origin.pdf
    • https://uploads.strikinglycdn.com/files/04b14b8a-833e-4bb4-a0d4-393c81315d46/bigukalisibokedin.pdf
    • https://uploads.strikinglycdn.com/files/ef737684-c074-4e45-97ae-fa969ae34e8c/1966_dodge_charger_383.pdf
    • https://vuziluguf.files.wordpress.com/2020/11/29395699227.pdf
    • https://romekelisefo.files.wordpress.com/2020/11/nitunawikudaremutujozudok.pdf
    • https://uploads.strikinglycdn.com/files/3173d224-1685-480b-b11f-3cef1af8fb1b/rifapizebapiji.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_off000057a5.bin
a272aa0143c1a0557e880567e0fa599b55a1f042720bde5ed22438ae99ad8a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x57A5 5328 bytes
font_01_sfnt_off000069bc.bin
0ae2897104474b00d4c1e44fe5a6e2f06d611ba645c08518c2ac28ae65137676
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BC 11964 bytes