Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eef8eab56708dc…

MALICIOUS

PDF

41.7 KB Created: 2020-08-09 11:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14bb7f9a0c1eff757e0102cc8b8969ff SHA-1: 85cad4cdd641571b82f8e22d685e7a54489cad4a SHA-256: b9eef8eab56708dc7d68aae3c7d8fe8e2b6db075ffaa3a17f45b240fba8ce7be
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=c.+r.+p.+c+act+pdf'. Additionally, it exhibits a PDF link farm behavior, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0431/6889/1040/files/posuxaxateziw.pdf'. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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.ru/pify?keyword=c.+r.+p.+c+act+pdf
    • http://files.amadorrcd.org/uploads/1/3/0/7/130775309/xajuloduweg-lamedirinajamal-togamalazetolop-kiremigusikupo.pdf
    • http://tiweb.emilyvanmeter.com/uploads/1/3/0/8/130814328/junuwapij.pdf
    • http://files.brownswoodnursery.com/uploads/1/3/2/6/132681409/gawasojudoxi_soxidewak_ranuxe.pdf
    • http://xovetakod.tritoncoral.com/uploads/1/3/1/3/131380213/2955830.pdf
    • http://dinate.katecheeseman.com/uploads/1/3/0/9/130969742/50888.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/posuxaxateziw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/genetics_from_genes_to_genomes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/zegomowijonasozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/jidulereperaxoxonafipija.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/xexowalixi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/lufavajuvuvibejunatane.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/41488141973.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/66706048224.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/dizubemitugol.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/causas_y_consecuencias_del_alcoholismo_en_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/zopududaju.pdf
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/33283244086.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/34917536202.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000655a.bin
9dd6a7b91389e24bcdf62ba80f321300845e615eef4b4579aaeb0097349c17af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 4876 bytes
font_01_sfnt_off00007603.bin
193a2fd0cbe34e7e9c4f96e5a332a1291172502a4f2f5cd5a164647e64815228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 10584 bytes

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