Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca463176a3741103…

MALICIOUS

PDF

45.9 KB Created: 2020-08-15 01:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c578dc79eb111d2802cb9215f99a6b2c SHA-1: 48c6bc55ee2eadc3c6fa9065e3580a4297df189b SHA-256: ca463176a3741103676f641141fcc4f9bee3a21eaba16fa4ff560e919dfe629e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be a URL, suggesting it is not intended for direct user consumption but rather as a lure or a container for malicious links. The primary attack pattern observed is the use of a link farm within the PDF to direct users to potentially harmful content.

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.cc/pify?keyword=android+marshmallow+6.+0+1
    • http://files.arimasarts.com/uploads/1/3/2/8/132814476/5353ba9a9654ba.pdf
    • http://wopel.themldanceacademy.com/uploads/1/3/0/8/130813094/xilubulu-xiwikibuwiwezi-wufefon.pdf
    • http://files.ebenezerbaptistchurch.us/uploads/1/3/0/7/130740069/nimerikizoxas_wewelazederug.pdf
    • http://boparejog.pro-activemuscletherapy.com/uploads/1/3/0/7/130739063/8aa813782.pdf
    • http://guwuwipo.thegauge.us/uploads/1/3/0/7/130775388/e7e5666942.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/how_to_draw_cartoon_characters_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/attach_digital_signature_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/7673941113.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/subway_franchise_operations_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4992/files/embedded_c_programming_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/1337015099.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/gabuxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/15973039604.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/counter_strike_online_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/dirixusiledoti.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7992/files/jawobigabomegakevuxis.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/ketifot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/libro_verde_del_ganoderma_lucidum.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_off00007613.bin
06ccaac758ff538225dae81abca7dea4064d6a7160385274791f94b5888f1ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 5528 bytes
font_01_sfnt_off000088bd.bin
31605c1883db97f77a1eb849c832bbb1c6cfe3d37843001de72f7f9969883259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BD 9920 bytes

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