Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3ed211d6b6ed59…

MALICIOUS

PDF

52.4 KB Created: 2020-08-21 14:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88c67a37af1d253ef715579388a0f1a SHA-1: 731918d8f1e385ff36c2976bfcac1f8cb8084183 SHA-256: ee3ed211d6b6ed593df1c864f6640eb60134b4785227ff4f6c9887e258d739ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many pointing to Shopify-hosted PDF files, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=new+purulia+baul+dj+song'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and a repeat of the malicious URL, suggesting it's a lure or part of the link farm infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=new+purulia+baul+dj+song
    • http://doniw.centralhighchorus.com/uploads/1/3/2/6/132681464/6667671.pdf
    • http://files.mocommunitytrees.org/uploads/1/3/1/0/131069781/9419388.pdf
    • http://files.tweedlebeedle.com/uploads/1/3/1/4/131437770/nizotasirameg.pdf
    • http://files.counseling4thesoul.com/uploads/1/3/0/7/130776386/basirutepo.pdf
    • http://files.peteraltschuler.com/uploads/1/3/1/4/131483254/linowatimew.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/3438362723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6226/files/super_key_candidate_key_primary_key_foreign_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/33020602832.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/dizakufuvoturowavub.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/delexo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/pondicherry_university_recruitment.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/acrylic_sheet_cut_to_size_manchester.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/surah_ar_rahman_alkalam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/que_es_acidosis_respiratoria.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8501/files/report_missing_driver_s_license_california.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/sefupebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1348/9318/files/58313898336.pdf
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/6683906662.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005130.bin
dcf36de602c71c17bed5bc1784ff730f8740af229f864ab3fdf6924d68415f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5130 5208 bytes
font_01_sfnt_off000062ee.bin
cf6421cd5e869925a187a007b987a3b861c45477e581388fe44a7ef3781c6508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 9260 bytes
font_02_sfnt_off00008024.bin
fe7f9cac84c017ef62107c8d325a3997295bbdb40466b9b5794a920a43816603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 2284 bytes
font_03_sfnt_off00008a62.bin
b5c8b54a52429fbd9f67cbef1fb0879e92c902e0dbffc11e0f03cee4fbfadb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A62 14092 bytes
font_04_sfnt_off0000b5a0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 4324 bytes

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